phonemag.com has the latest rumor about the actual release date. An updated rumor on their previous rumor .. :p

From the site:

PhoneMag.com just got an update by the same reliable and trusted Asian carrier source that the first batch of MPx smartphone will only have 32MB of memory releasing in mid December. This is an update to the November 30, 2004 release date in our previous article. Motorola is expected to release a second generation MPx with 64MB of memory in Spring of 2005. The specific release date is still undetermined, but we¡¯ll keep you posted as soon as we know.

Cingular will be the first to get the Motorola MPx220 smartphone on October 18th 2004. This is an update from our previous post citing the September 27th release date of the MPx220. We also got word that there integrated camera on the MPx220 has not been improved very much from first release.

phonemag.com

Their previous rumor release date

Previous Rumor