In B&H the Leica S2 and the Summarit-S 70mm f/2.5 ASPH lens are listed as “Temporarily unavailable”. If you are interested, the Leica SIS in Palm Beach has both items in stock:
If you buy from the Leica SIS, you can apply 10% of the purchase price toward a workshop at the Palm Beach Photographic Centre (that’s a lot of classes). Update: I was just told that the 10% deal is not valid for Leica equipment.
At the same time the Leica X1 is nowhere to be found in the US but it should be coming to retailers very soon.