Translated from the swedish site:
Originally Posted by happymtb.com
Pricing and availability
Shimano has not given any precise Swedish prices on components. But an initial price indication is that the Ultegra Di2 will cost about 10-15% less than the mechanical Dura Ace. This corresponds roughly to a halving of the price compared to electronic Dura Ace.
Shipping in limited quantities will start from September 2011. Shimano expects a big demand for Ultegra Di2 and apprehensive about not having the capacity to meet customer needs. How will the availability for next season remains to be seen.
OK, I've flip-flopped. This might end up on my tri bike.