Microsoft’s Senior Director of Windows Phone 7 development, Brandon Watson tweeted out to any published webOS developer that Microsoft would give them all the tools they need to be successful on Windows Phone 7. This includes dev tools, training and free phones. Windows Phone 7 has about 30,000 apps currently in their app marketplace. This is a lot less than Android and iOS however they are adding apps at a much quicker pace than RIM/Blackberry.
As pocketnow points out, as an April Fools joke they said that Microsoft was buying webOS and rebranding it to WP7, now that gets close to the truth, or as close as it will get.