A few weeks ago, Brandon Watson of Microsoft let it be known that they were going to be sending out actual hardware phones to developers and too look for that announcement "soon".
Well, today at TechEd 2010, Watson provided further details and it looks like devices will begin shipping in July. How many handsets is not know, nor which ones, though presumably a large number will go out and they'll be of the LG/Asus/Samsung variety that we've seen so often.
The month of July gives developers plenty of time ahead of the "holiday 2010" OS release date to experiment with their software, so we can expect software not rushed to the Marketplace.
Overall, Microsoft seems to be, dare we say, executing this launch of Windows Phone 7 effectively? They're meeting deadlines, making progress and keeping developers happy. Granted, the road is still long but so far we like this measured approach.