Rumours are circulating that Android 2.2 (Froyo) is scheduled to hit the Motorola Droid (Milestone) sometime in the next few weeks for selected devices, after that the update will become available for all devices throughout the year.
In terms of other devices such as the Samsung Galaxy S, Dell Streak, HTC Legend/Desire/Wildfire and T-Mobile’s MyTouch product line should get the update by the end of the year, but that is all that is “known” for now.
Source: [H]ard|OCP