Sony Ericsson XPERIA X10 heading to AT&T and T-Mobile?

There is word floating around that Sony Ericsson is planning on two variants of the XPERIA X10. While it’s far from confirmed, it appears as though SE’s plan of teaming with U.S. carriers to subsidize this bad boy is working out. Both versions will have 3G support for their respective carriers, which means the T-Mobile version will have support for the 1700MHz band. SE is also saying it plans to have this phone out in early 2010, so we’ll find out sooner than later. We’re just wondering what pricing will be like since this device will have to be heavily subsidized to come down from its $700+ price tag. Hit the jump for some device specs.