Latest subsciption MMO to test the F2P waters is going to be Star Trek Online; which was announced during an investor call with Cryptic’s new owners. I think a lot of people were expecting this to happen at some point, and we’ll wait to see how the various options will work out and what Cryptic may offer their lifetime sub holders. I think the monthly point-stipend that LOTRO gives out works fairly well for keeping lifetime players sweet.
I also remember commenting during beta that I thought STO would suit a F2P model better than subscription, and this is great news for anyone who wants to try a game with solid spaceship dogfighting without sub fees, especially if you like the Trek trappings. It might also be a fun game to play alongside SWTOR, which isn’t so big on the space battles but is likely to be stronger for storytelling/ roleplayers.