I don't think we'll see his "Dear Mr. Murdoch (2011 Mix)" or the "Almost Completely Nude" version on the album, except maybe as bonus tracks, and even then not as part of the album proper. So, we know he's done one track for sure and possibly two others. I'm willing to bet there's more. Unlike Brian, Roger doesn't seem keen on giving the world progress reports, which I sort of like. It's an old school approach. From his point of view, there's no pressure on him to have the album done nor fans constantly saying he's taking too long. He'll release it when he releases it.
I would have guessed "Woman, You're So Beautiful," would be a contender for inclusion. For me, it doesn't matter that his son sings lead. Or maybe he'll do his own lead vocal.
Anyway, it's something to look forward to!