This news is going to own all genre message boards for the next week as details emerge.
I don't recall Disney buying Marvel for $4Billion being big news.
I think this is bigger for the sheer fact an EPISODE 7 is being touted as not only coming but being given a general target date!!
I think they'll have no trouble getting Mark Hamil to return in some capacity. The Droids are easy enough as would Chewie if need be. I don't see an immediate scenario where Carrie Fisher or Harrison Ford return. Uncle Luke can mentor the twins in an Obi-Wan role to the twins depending on how they structure this.