http://us.battle.net/wow/en/blog/8713870/World_of_Warcraft_Patch_52_The_Thunder_King_Round-Up-2_27_2013
It is a small preview of the new Free Patch in WoW. It is NOT an expansion although it might as well be one, it is just a Free Patch. Blizzard calls them patches but they might as well be new games. These patches happen ever 2-4 months and you have never seen any like that in any B2P/F2P game.
Compare that to ANY F2P/B2P content updates. THERE IS NO COMPARISON.
Blizzard is releasing in just a Free Patch with an entire New Zone, FOUR New Raids with multiple Top-Tier quality Boss enounters, New Factions, New Reputations, New Questlines, New World Bosses, extensive overhaul of classes, multiple Gear Tiers, New Dailies, tons of new Fluff, counteless of new items etc. etc. For a more complete description of Patch 5.2 you can check http://www.mmo-champion.com/content/
Thats the real difference between P2P and B2P/F2P games. One offers breathtaking and massive high-quality frequent content and ther other offers tiny minor updates for a static and stale world.
Personally, I am confident ESO will be P2P because Zenimax has already discussed how ESO will offer world-class service.