Today it was announced that Warhammer Online will not have a time limit to the trial version of the game. You heard it right: no more time limit! But it comes with some restrictions as listed in the trial FAQ:

Endless Trial accounts are restricted to Tier 1 of the Empire versus Chaos pairing. This includes Tier 1 scenarios but does not include access to the Capital Cities or the other racial pairings within the game.

Endless Trial accounts may receive mail and purchase from the auction house; however, they cannot send mail or create auctions.

Endless Trial accounts are limited to designated servers. If you’d like to play with friends on other servers, you will need to purchase a retail copy of the game and transfer your character to their server (or create a new character on their server). All characters Rank 11 and under on purchased accounts have access to unlimited transfers, with a max of one transfer per day. Please note that you can only transfer characters to the same server type as the server you created your characters on (Core, Open RvR, and Roleplay). Please see the full server list here for details about each server, including server type. Alternatively, if you have a friend who is currently playing WAR, you can ask them for a Recruit-a-Friend code that will allow you to create a Recruit-a-Friend trial account which has access to all servers. Please see the Recruit-a-Friend section for more information.

Sounds like a good deal, and a great way for you to play for a longer period of time to really see if you want to commit to that monthly fee. More details on the Endless Trial and where to download both PC and Mac versions can be found here on the official site.