I actually prefer this to a Pokemon Z/3rd version.
I mean, i won't say i wouldn't buy it, but playing a whole new campaign is waaaaay better and hopefully allow them to correct some issues (single save file, HM slaves, etc). With Lord Helix grace, they may even add a nuzlocke challenge mode, can you image how awesome would that be? (Ok, wet dream, but could happen)
I am hyped, i enjoyed X&Y a lot actually. I was away from pokemon since gold/silver, but i am very happy i came back. Just hope i can finish FE:Fates and Pillars of Eternity first. X&Y sucked over 120 hours before i knew what happened.