I play a few marquee titles per year - all single player. I have a handful of titles I really love and love to play on console. Coincidentally, my 360 finally started failing after 7 or so years of faithful service a few months ago as I was running through all of the Dragon Age games again in prep for Dragon Age 3. If they can get my favorite games working well with the DLC and such, I'd probably buy one a One - I can replace my 360 and another major console in the current gen in one system. Attractive proposition, particularly if I get a deal on one this holiday season.
I suspect the publishers won't enable backward compatibility for titles they've "remastered" or think they may remaster in the future. Or it could be mostly titles that lean on DirectX and XNA calls for everything, rather than coding against the metal, because that's easier to port. But if it doesn't turn out to be a joke, this could be a good thing.