RIM wants to emphasize that this is not final hardware or the OS. I think it is great that they are getting devices like this out into the hands of developers though so they can have apps ready to run on this new smartphone platform. Microsoft did a great job with this when they released thousands of the reference devices from Samsung running the Windows Phone 7 Technical Preview.
I hope that this developer program is used by developers because devices like the rumored BlackBerry London look fantastic and I would give one a try to use with my PlayBook. I am not a developer so won't be able to secure one of these Dev Alpha devices, but I hope we see developers writing about the devices and showing them off in May. These devices will also not be given out to BlackBerry World attendees and are strictly for developers.