About the free trial, I dunno. Maybe after the official release on the 23rd?
And although I loathe the fact that every MMO today has to compare to WoW (what did it really do besides cater to a casual crowd, and making MMOs mainstream? It's not that good of a game after you've played it for a long while), here's what differentiates AoC from WoW:
The visuals, both the graphic level, and the design of everything, is absolutely stunning and breathtaking:
Then, the atmosphere: All the quests are fully dubbed with really fine voices, and there's little cutscenes for each quest, and even full cutscenes exposing the story for main quests. Oh and instead of just reading the quest text, you can interact with the quest giver, talk to them in multiple choice dialogs:
I don't know if all the multiple choice choices (there are 2-3 for each and every NPC you can talk to) really change anything about the quests (never tried a quest twice

) but damn, it really really adds to the atmosphere of the world. Feels much more like a single player RPG in that regard, which is a good thing.
You not only have a talent tree to put points upon levelups into, but you also get around 20 stat points per level which you can put into things like faster OOC regeneration, faster running, hiding (every class can try to stealth), perception, more or less aggro generation, etc. Feels much more like your own character, than just slapping on a predefined talent template. Oh and you can put points into climbing too!
Then of course there's the whole combat system. No autoattack. Every stroke of the sword you want to make, you'll have to hit a button for. There's 3 (5 at a higher level) different sides which you can hit from, and enemies have "shields" on the corresponding sides (which the player does too, and both players and NPCs can and will change the facings of their shields in combat) which soak up damage, so the combat is very dynamic. The special abilities are all combos. To cast them you have to first hit the combo button and then do the corresponding moves, like one swing to the left, one to the right, then one to the middle, to
perform the special move. Spellcasters get spcial Spellweaving: They can enter spellweaving state (cannot move, slowly drains stamina) and then "spellweave" 2 or more spells together to create a new devestating spell with all the combinded effects and some bonus to unleash.
There's collision detection also which is great. You can't just run through players, and neither can mobs and vice versa. Which is really great especially for me as a tank: When I stand in a narrow hallway no mobs can come through to hit on the healers for as long a I live.
Oh and of course, EVERY attack is area of effect. Swinging your sword from left to right? You're gonna hit everything that stands in front of you. Spells too, they either hit everything around the caster or everything aroud the target. The same goes for healing spells and crowd control.
Oh and lets not forget about the maturity of the game. Women are plentyful, prostitution is a running business (although there are NPC women in the military also of course), and every hit you make makes blood splatter. Then there's the whole fatality system. When you kill someone with a combo or a spell there's a chance of proccing a gruesome fatality (slicing of heads, arms, etc. in my case, electrocuting or burning someone alive for some spellcasters, drawing the soul from the body for the priest, etc. pp) which not only looks rad but also give you a buff so you'll hit harder and regenerate health, stamina and mana faster.
The game isn't 18+ for nothing.
Last but not least, no character looks exactly like another like they do in WoW. There's like a gazillion options upon character creation, with sliders for everything: Cheek height, cheek length, chin length, chin width, boob size, butt size, thigh size, feet size, nose size, eyebrows height, color of eyes, tattoos, etc., the list is almost endless. On top of that comes the realistic look of the game. Armors look like something a person might have worn some thousand years ago our time to battle.
Well those are just my impressions from playing the game for the weekend + monday and leveling to 27

but the more I play the game the more I love it.
P.S.: Oh and the PVP. At my level there's only world PVP and minigames like the WoW Battlegrounds, but after level 40 you can build guild cities which you thenafter have to defend from other guilds in epic battles. I'm really psyched for that. I dunno at the moment if I and my reallife friends who play will join a big guild, or go with the implemented mercenary system: You can put yourself up to a mercenary list, and guilds can then recruit you for gold and for their inter guild battles. Sounds awesome if you can make yourself really known as a funky mercenary on your server
P.P.S. Oh and what I almost forgot, one of the coolest things. There are no cookie clutter classes. None of this Deftank who can tank raidbosses but can't do shit in pvp and needs 1-2 minutes to get a normal mob down alone shit. Every class does damage here. Like my 2hander talent tree for the conqueror. There's lots of talents which let my skills generate more aggro BUT ALSO do more damage. Or knock back enemies which is good in pve and pvp. Stuff like that. The healers also aren't supposed to spam the same heal on the tank the whole time. Most heals are group HOTs and while each healer has a single target heal that heals "normal", you get a debuff after that so you cannot be healed by the same spell for 1 minute. This all binds to the dynamic gameplay.