Another new sportboat of this type is the Laser SB3 http://www.teamvanguard.com/2007/Boats/SB3/default.htm
My buddy Anthony sailed it recently and there is a great review and pictures on www.anthonyandcy.com
I've sailed it a couple months ago, it's a lot of fun downwind with the asym but upwind it is slow and not much fun. Best part is hiking is illegal in the class, you have to sit facing inboard!
These boats are in a position to take many Melges (20 and 24) customers.