This of course could be posted in either the Prequel or Classic Trilogy sections, but recently I was seeing adverts for this "Digital Collection" obviously coming out as a cash-in to build anticipation for the new movie this Christmas, etc.
Anyway I was curious if there was anything different this time around and I'm not surprised to learn that no, this is pretty much identical to what we got on Blu-Ray in 2011, just slightly lower in quality.
So if you already have the "Saga" collection, there's no reason to get this unless you're too lazy to rip the discs if you wanted to watch it on the go, I suppose. Price wise it costs the same (or slightly more, depending upon where you get it) as the Saga BD set. I suppose one good thing about it is that if you wanted to buy an individual movie (instead of a whole trilogy) you could do so. Just remember these are the modified versions (SE 3.0) not the theatrical versions (except Episode III which IS the theatrical version and Episode II which is the cut shown in digital theaters in 2002, and I guess you could say Episode I 3.0 with CGI Yoda was shown theatrically, albeit in 3D).
Here's a review that I just looked at explaining it in more detail:
PS: There's also a link to the Episode VII teaser trailer #2 on the page so if that's spoilers for you, don't look at the bottom of the page.