I've played Risk since I can remember, I love it. The length of the game is part of what appeals to me, it's an all evening thing. Same goes for a well played game of Monopoly. I dislike games that only last 1/2 hour or an hour and then you're left sitting around arguing over which game to play next.
I'd personally like to see them reissue Castle Risk, it was a great game IMO.
As for their idea about pantheons battling for the ancient world, that could be cool, but I'd probably want to see the implementation before I said "Yeah, I'll buy that"
As far as an FR or DL version, I don't know. I'm not at all familiar with Dragonlance, and the Realms don't strike me as political enough or settled enough to base a wargame on. I picture isolated clusters of nations with vast amounts of space between them.
GH risk? Heck yeah, I'd buy that without hesitation. There's a fair amount of us Greyhawk fans who have been playing GH Risk for years anyway, using the map/gameboard from the Greyhawk Wars game put out by TSR around 1990 with the pieces and rules from either Risk or Castle Risk, since the mechanics of GHW were generally considered to be kind of lame.
I haven't, and don't plan to, checked out the Risk 2210 game, simply because the genre doesn't appeal to me, but I am glad to see Hasbro advancing the game and opening Risk up to a new batch of players.