I'll be able to answer a few of these questions.
1) We are hoping for 8 in one skirmish, however this may change once we get closer to release.
2) Ranking isn't just based on player ability, it's also based on ***ets. If you do lose almost your entire army, however we will have something in place to show highest achieved rank and such so that your not going down in reputation.
3) Humans, Orcs and Elves all have walls, so far Dragons have been undecided if we will include some sort of stronghold set for them.
4) Not at the moment.
5) Yes you will be able to check your stats on Xbox Live, and also on Reverie Online.
Good variety of questions, keep em coming!