I'm sorry, we have no plans to release such a kit due to the placement of the pump and reservoir. It would cause too many compatibility issues due to the loss of the optical bays.
We don't have any plans for an H120X, but we are considering releasing an H140X in about 3 weeks to a month.
Our naming scheme is a little different. The first number tells you the number of fans and the second tells you the size of the fans. It's actually a simple way to understand what fans you need and how many for the radiator you purchase. Also, a 360 radiator isn't actually 360mm long and that's a bit misleading for those that are just getting into water cooling.
Yes, this kit is 2011 socket compatible and thus it's also compatible with the latest 99X socket.