Dude, the 10th Anniversary Ultimania exist solely to connect VII with the rest of the Compilation. Expect the re-writes, you're going to now have to listen to Cloud do this:
Cloud: ...after Sephiroth saw the monsters in the reactor, Genesis appeared and goaded him, while his forces attacked Tifa outside.
Barret: Wait a minute, you mean the other legendary SOLDIER 1st Class was there too? I thought he died a year earlier?
Cloud: I though so too...
Tifa: Whatever happened to him?
Cloud: I don't know.
And you'll also get this Cloud mentioning the Turks dealing with and stopping Zirconiade (or however you spell its stupid name) and Jade WEAPON, probably see references to Deepground in the Shin-Ra building, Rufus will mention how Barret's terrorist group is a shadow of the true organization he himself ran, you'll probably stop by in Modeoheim, the remnants of Banora, and any other new location added. You'll probably have to see the opening to Dirge of Cerberus (which is the retcon excuse as to why you don't actually see Yuffie or Vincent in the original game's ending, they were in Midgard helping evacuate people) and you'll probably see some new additions to the ending that allude to Advent Children. It's coming man, just brace yourself and "enjoy the ride" as you always tell me.