Look it's possible he won't come back. Wouldn't shock me. However, LCAB and Fox are pretty firm on this, and Foxy for sure knows members of the family, and possibly even the man himself (although I don't want to put words in his mouth, but if he did he probably wouldn't come out and say THAT).
Here's what we know...Rooney has been actively trying to get back in the good graces of Evertonians for a couple of years now...started with the articles in the Echo a few years back talking about how he's still an Evertonian, and apparently burying the hatchet with Moyes publicly, and he is pretty consistent in his public comments (press, Twitter) about still being an Evertonian and raising his son to be one as well. He even showed up at the FA Cup final against Chelsea in blue with his family. I can imagine that annoys United fans a bit, so why do it? There's only two explanations...1) it's true and legit - he really is, and will always be an Evertonian, and 2) he's laying the groundwork for a return and he knows he's got fences to mend that won't be mended with one surprise announcement. Or BOTH.
So you can sit here and say it will never happen, but the tea leaves suggest that's what happening, and it's being confirmed by 2 people seriously ITK. Can things change? Absolutely. But it's way more likely to happen than not based on all of the above.