Maybe AT&T will acknowledge Android after all. According to the specs page of the Sony Ericsson XPERIA X10, the American version of the XPERIA X10 packs 3G bands that fit with AT&T and not T-Mobile. To quote:
UMTS HSPA 800/850/1900 only available for phones sold in Americas (except Brazil) and Australia. UMTS HSPA 900/1700 not available for phones sold in Americas. UMTS HSPA 1900/2100 available worldwide.
Obviously having the XPERIA X10 head to AT&T is in no way confirmed, especially considering the fact that AT&T has publicly ignored Android. We also have to consider the fact that our friendly neighbors to the north, Canada, also has carriers (Rogers, Fido, Telus) that operate 3G with those same bands, so there's a possibility that it may land in Canada and never officially make its way to the States. One thing we can discern from the snippet above, however, is that it doesn't look like T-Mobile US will get the XPERIA X10. Sorry Magenta fans.
If AT&T does officially carry the XPERIA X10, it'll definitely need to be refined and made more affordable considering the rather lukewarm first impression that the XPERIA X10 received and the exorbitant price it's rumored to be. We're hoping that the Sony Ericsson XPERIA X10 does release on AT&T but more importantly, we're hoping that the Sony Ericsson XPERIA X10 fulfills its initial potential as being a great Android device.