You take your H2 and attach it's winch to the tow hook on the H3.
JOKE!
I was looking at that at the dealer last week.
A new bumper will have to made that will allow a set up like the H2 has. I have the WARN winch bumper on my SUT. The winch mounted to the frame where the front reciever was. Since the H3 doesn't have this, a new support will have to be welded up. You may want to call WARN to see if they have any plans for this.
If you use the Calss three reciever on the back you could use the WARN mullti mount winch for the rear, but that won't help you over the top of anything though. I'm sur eit won't be long until Drty, WARN, Road Armor, or someone else comes out with one.