Yeah, better graphics and usually some cheats are included. Do note, that on PC you won't be able to get the original versions of games ( FFX and FFXII for example ) and you'll be restricted to either playing the remastered version or emulating.The remasters are pretty much the same game with better graphics. They enhanced everything graphical wise except from the NPC's which is a minor detail that you are not suppose to notice. The remasters are actually cheaper especially during holidays.
I think FF7 remaster and the sequels aren't bad. Also there are some really good changes coming with the android and the other platform games. So the variations are worth playing too. I'd say it's worth investing if you are fan of this franchise.
I think they earn a lot of money to the franchise too. So they are going to be just pumping out more stories one after another. That's what I have learned.