I would put my money on it being 60fps because it is a exclusive title (I'm assuming Sony owned studios know how to optimize performance on PS4) and it's pretty much a upgrade for graphics, not a ground-up built game. Either way I'm buying it again :)
I would rather have a better looking game at a consistent 30 fps than a worse looking game at 60 fps. Obviously it depends game to game (Gran Turismo for instance has to be 60 fps) but I generally prefer 30 fps.
This isn't why. Sony can't just make it backwards compatibility. The reason that PS3 was so expensive the year it was released (and a little while after) because they pretty much put a PS2 into the PS3, which wasn't good for sales because again, it was pretty expensive. Now Imagine how much the PS4 with the PS3 inside it, that would be a whopping price. Sony wants to make profit, and make an affordable console, which they did overwhelmingly succeed. This is just 1 reason out of many why Sony didn't put backwards compatibility into the PS4.
GOTY editions don't normally come out within a year and at the SAME price. This is an obvious money grab to capitalize on the success of TLOU. And unless Sony offers a $9.99 upgrade to those that purchased the PS3 version, I'll call it what it is.