I would also like to know, given the history of cyrodill, what will most likely be the outcome of the empire after the death of uriel septim and martin septim? i know this is speculation but it would help me out greatly
Civil war, probably, as the Legion commanders try to seize the throne. After years of fighting, someone will take control and proclaim himself the new Emperor, and the Empire will remain, though weakened. A (in som cases heavy) loss of influence in regions such as Sumerset, Hammerfell and High Rock, probably, due to their disunity and internal conflicts. Argonia too, off course, since the Empire can hardly control it as it is. If the rumours about Valenwood is true, they will loose control over that too, I guess. And Elsweyr.. Well, it has fallen to crime and drug lords allready so I guess there's not much to loose there. Well, that's the short verision of what I think will happen.
On the other provinces: Morrowind will be strengthened, due to it's apparent unity and important trade. I wouldn't be surprised if the next Emperor's Imperial Battlemage happened to be Dunmer, or even a relative to king Helseth, if you know what I mean. I don't think Skyrim would accomplish much without the Empire, but there will probably come a few throne-contestants from that region, besides the Legion ones.
As for semi-province Orcinium - it will stand by the whatever general and/or warlord that seems to be most probable to win the wars, or the one that gives them the best promises. Gortwog is one sneaky bastard.