Title about says it all, don't it. Also of note in the article, updates to current devices will be up to the carriers. In other words, don't hold your breath that you'll be able to (legally) upgrade your current WM5 device to WM6.

*According to John Starkweather, a group product manager for Microsoft’s mobile and embedded devices division, the latest version of the mobile OS will ship in the United States first on new devices from T-Mobile USA Inc. *

Read: Microsoft: Windows Mobile 6.0 coming to T-Mobile USA in second quarter :: RCR Wireless News