Yeah, I have to agree with giving people with canceled subscriptions a free return period. With the amount an MMO changes from patch to patch, it would be nice to be able to pop back into a game you'd left just to see what was new. I've quit lots of games, and then by reading up on MMO news I see things they are putting in with new patches, and it kinda makes me think the game might be better than when I played. It doesn't make me wonder enough to actually pay to start my account back up, but if they even just did like CoH did with the free return weekends, it would be a huge incentive to try out games I'd left before. If it turned out that the patches had fixed things that had before turned me off to the game, I'd probably be more than happy to try things again.

WAR does have a trial that 10 days free for previous subscribers. You do have to jump through the hoops of providing payment info and then canceling before the 10 days is up if you don't want to keep playing after 10 days. However, the free play for former subscribers does exist.

http://www.warhammeronline.com/call_to_arms/re-enlist.php