Damn I'm getting excited already after hearing from you whats in stored for me in the upcoming quests. You are also right about the Malestorm, so many questions to ask. Hopefully, Blizzard will answer all of them in the upcoming expansions.
Other than lore, I was just wondering which new races they might be adding up? May be they will bring a new faction altogether(The burning Legion). Still can't say anything for sure.
As for MBL raids, they do 25man raids as well. Best of all the raids are scripted so you'll enjoy them as much as in retail servers. Not to mention that MBL has a TeamSpeak server were you can voice chat with others while raiding. Its a whole new experience altogether.