The largest difference from the previous 10-day trial is the new trial will give players an unlimited amount of time to test out the game. But at the same time players are restricted to the first 10 levels and are only able to explore a few tier one areas, which include 3 PvP scenarios. All of the available classes are playable in the trial for testing, but that is about all the content you are getting.
The trial will be using streaming technology to stream content only when needed. To begin playing though, players will still have to download a 1 gb client. If you are still interested visit http://www.warhammeronline.com for the client download.