Taking a second look on it... It seems to be 70% accurate now keep in mind guys that cataclysm was in developement when wrath was still in beta and in an interview with blizzard im not sure whether it was a year ago or not that they have planned 3 expansions ahead already. Possibly so we have 2 scenarios as a next expansion but before I go into detail they might aswell expand an idea I mean look at pandaria it was originally planned to be 1-10 but later on turned as an expansion itself. As for cataclysm the choices that were taken where: gilneas,grim batol(done as a dungeon), broken isles (goblin starting area),The maelstrom, Deepholme,skywall (uldum+dungeons and raids most possibly),Abyssal maw (although scrapped, but we got the zone which is vash'jir but possible return) and the firelands which turned out as a raid.
Now the first next expansion scenario would be the emerald dream consisting of these zones in the plane set excluding hiji and pandaria along with cata areas and it might be merged with the burning legion.
The second scenario as a next expansion would be the south seas in the maelstrom set just taking out these areas. I think it should be accurate as I've mentioned before that blizzard plans ahead for their expansions but I'm most likely sure that it will be a burning legion one due to wrathion predicting things that azeroth is being invaded and things like that.