I will 100% get this on release day. This can be considered doubly so for including FFX-2 because it is an amazing game and a great story too. It is different from FFX's story/mood but I loved it back in the day. I will also say that when these are confirmed to be FFX International and FFX-2 International + Last Mission and perhaps the "Eternal Calm" video also done in HD that I will buy this the minute it goes up for sale, without a moment's hesitation.
EDIT:: No, not perhaps, the Eternal Calm really should be in this collection. It isn't that long and is a nice little bridge into FFX-2.
They have my support. FFX was my favorite (opinion, and 1200+ hrs), and adding the int. content is a huge plus! I usually don't support rehashes/ remakes (Resident Evil Remake being the exception), but Square is doing horrible right now, and I think this will start to put them on the right track. Releasing this to hold off people until Lighting Returns, and then get FFXIV out so they can free up their main developers for Versus and Kingdom Hearts. I'm starting to have a little bit of hope in them (if that's alright with the fans:)