Replacement of Centro. They are completely eliminating the PalmOS, as it is being replaced now with WebOS. Centro is the last PalmOS unit.
They'll be keeping WinMo Treo on the roster for a while longer, it's their bigger market right now, businesses and all with EAS.
Pixie is the codename for the Palm Eos, though it's still up in the air whether or not the codename is Castle and there's another unit out there. It originally was supposed to only be going to ATT as a GSM unit but I believe that has changed and it might be like the Tour, where it went to multiple carriers. So it might be a Sprint and ATT launch simultaneously or around the same time.
ATT Specs...
* 4GB storage
* Price: $349 (pre-rebate)
* Camera: 2 megapixel fixed focus digital camera and flash / video capture
* Connectivity: Bluetooth 2.1 w/ A2DP and EDR, USB 2.0 via micro USB
* Removable 1150 mAh battery (4 hours 3G talk time)
* Messaging: SMS, MMS (picture and video only), integrated IM client
* Contact sync with AT&T Address Book
* MediaNet
* Cellular Video
* Email: POP3, IMAP4, and EAS support
* A-GPS
* Audio: WAV, MP3, AAC, AAC+ ringtones
* Video Playback: MPEG4, H.264, H.263
Two links to (not much) more info as there isn't much available to share:
http://www.precentral.net/palm-eos-thin-gsm-awesome Palm Eos: super-thin, 3G, and headed to AT&T?