The p2p does not effect content speed simply because at least to my knowledge they are not bringing in more devs. They already have a small army of people working on 2.0 and the existing 1.x version of the games.

Now the upcoming patches will probably have more content, but that is because alot of the major overhauls to the games foundations are coming to a close. Honestly Every update including 1.2 has been massive since this summer... the thing is there is alot more mechanic changes then there are content updates. Negative of overhauling a game. Now that those are slowing it seems, the time spend on that should be shifted to content instead. But I do not believe this has anything to do with paying.

P2P is simply added due to the fact that they feel as the game stands now... if you where to start you would have enough content to warrant paying for the game.