DDO just went free to play. Subscriptions are optional, but still have benefits. So you have a free tier where you can play the entire game from level one up to the cap. As you level up you'll find more and more adventures and areas locked unless you pay, but you can still play the game without paying. And they are introducing Turbine Points, which are a microtransaction system like Sony's Station Store.
Free Realms and Runes of Magic have proven that this model is attractive to players. And now with AAA titles like Dungeons and Dragons Online getting into the freemium game, who is next?
I have a suspicion that it will be Sony, with EverQuest II.
They have been hinting for a while of major plans in the works. They are adding lots of new content to the low level areas. They are adding content like Research Assistants that reward people for nothing more than subscribing (which most players don't want -- but would probably enjoy as a "premium" feature for subscribers in a freemium game). They are going to great lengths to finally fix the graphics engine (why bother in a game this old?!) We have the Station Store that no one asked for, which makes the most sense in a game where people aren't already paying you. And they have taken a rather sudden and unexpected interest in simplifying the more complex game mechanics (such as the spell naming conventions), which is a lot of work for very little gain, given that the current player base are already accustomed to the old names, and a game this old doesn't normally get a large influx of new players.
By going with a freemium model, EverQuest II just might gain that influx of new players that would justify all of this work.
At least that's what I'm hoping... I'd love to see new life breathed into my favorite game (at the moment :) ) by adopting a freemium model.