Sony Ericsson just dropped a press release announcing that the Xperia arc would be available for purchase in the U.S. beginning in August. On the upside, it will be available through Amazon, Newegg, Buy.com, and through Sony directly. On the downside, they give no mention of the device coming to any carrier, and the unsubsidized price is a whopping $600.
Though the arc presents an enticing exterior, the innards aren't so much so:
Android 2.3 (Gingerbread)
1GHz Scorpion CPU (MSM8255, same as the fairly dated Desire HD and myTouch 4G)