Um.. DAMN! Traffic crashed their site, but 500w/s with TTL - using their remote - 220 pops per battery - and it's itty bity. TTL is in the remote you place on camera, Canon right now, and they promise a Nikon version next year.
http://profoto.com/us/products/off-camera-flash/b1-off-camera-flash/item/b1-500-airttl?category_id=1863#media
http://profoto.com/us/products/off-camera-flash/b1-off-camera-flash/item/b1-500-airttl?category_id=1863#media