I'd think that Microsoft wouldn't be as heartless as so many have tried to claim, and charge for Minecraft updates.. Mostly they just charge for the extra things. Maybe they could do that with mods or something, haha.
Anyways as for FortressCraft, I can't wait to see that fall to pieces when Minecraft shows up on 360. I tried that game out, and not do worlds look the same, but it doesn't nearly have as many features or capabilities. Not only that, it has the strangest items. There's a Jet Pack. o-o