CyanogenMod has recently announced through their Google+ page that they would be working on CM7 (Gingerbread) and CM10 (Jelly Bean) after they release a stable version of CM9 (Ice Cream Sandwich). They don’t have the source for Jelly Bean yet which will be out in the next following weeks therefore they cannot really say what their release will be like. Fortunately though, Jelly Bean does not seem to be a major change over Ice Cream Sandwich and they should be able to do it without much fuzz… well, hopefully.
Anyway, most if not all devices that could run CM9 should be upgradeable. The Galaxy Tab is one of them, of course. Let’s wish the CM team the best and offer them our full support! Cheers!