The upcoming Skypephone IM2 (until now it was known as S2) from 3 has just passed the FCC and apparently will soon be available for purchase. Unfortunately, we don't know when and where exactly, but the FCC approval means we can expect it in the U.S.
The device will use HSDPA data network instead of GSM to help users save on voice calls. You know, that's how Skype works...
Stay tuned for more details.