Yeah, I highly doubt that the series will end at 52 based on the where the manga is. It is going to take probably close to 52 to catch up to where the manga is at chapter 181-182. And from chapter 183, I'd say the manga is beginning a new arc. The anime is catching up to the manga pretty quickly, if they want it to stay behind the manga then we will probably even get a few filler episodes. So I don't see any chance of the anime ending at 52, unless the anime is only going to follow this current arc and then the rest of Bleach will be manga only?

I don't believe anything I read on forums or fansites. Unless I personally read an official announcement, then I take rumors for what they're worth.