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We've already heard that the Xperia S will feature some sort of anti-stain housing together with fast charging-ability and it looks like it has the proper bands for AT&T's 3G. The ability to handle AT&T's frequencies doesn't necessarily mean that the Xperia S will be joining the carrier's line-up, especially now that the Xperia Ion was unveiled as part of AT&T's LTE line-up.
The Sony Xperia S packs a 1.5GHz dual-core processor, 4.3-inch 720p Reality Display, 12-megapixel Exmor R main camera, 720p-capable front-facer, NFC support, HDMI-out, 32GB of internal flash storage, and Google Android 2.3 Gingerbread with Ice Cream Sandwich update coming later on.
Source: FCC