1. I don't have any information about that;
2. I haven't heard of any intention of opening a poll, the opinion of the players seemed pretty solid when the proposal was made;
3. Idem #1, although I believe Cataclysm is still receiving updates, just at a slower pace than the other expansions;
4. There are no plans to upgrade, but if there were, Edifice has been quite clear that transferring "up" expansions is feasible, "down" isn't; the reason for that being, in general lines, that when you upgrade you pretty much just add or tweak things in the character, while if you downgrade you have to actually remove them... you would have to scan the character for every single item, mount, achievement and everything else to remove everything that doesn't exists in the previous expansion, which would then lead to providing replacements being required so characters aren't naked, and then what's a valid replacement? The weakest item in an expansion is usually more powerful than the best stuff in the previous one, but would it be fair to just give the best item in exchange for some green or white? If not, what should be given instead? What if the player complains that's not the item they wanted, that they want a different one of the same iLvl, should we manually go tending to each character of each player individually to hand out custom picked items? And then there are stats, skills, mechanics, currencies, gold... it's a huge mess, with extremely wide room for bugs, mistakes and tears.