The press blurb specifically describes it as "original/unedited music ... [as written for the film]." That can go a couple of different ways but hopefully it's not a PHANTOM MENACE: Ultimate Edition situation. The boon and the burden of streaming is that the conglomerates can make content available on the cheap that they'd otherwise keep locked up, but at the same time they can dump a lot of content on the cheap without curating it.
So long as this isn't like Phantom Menace UE I will be buying it. With John Powell involved I expect it will be done right. However I dont entirely trust Disney to make this available outside the US. If they do I'll add my support in the vain hope that it shows there is a market and we might be able to get deluxe editions of the other 10 Star Wars scores done right.