We've gotten the message: Chassis 1 specifications for Windows Phone 7 is "black slab" style--long 800x4800 devices with an optional slide out keyboard (with only the LG C900/GW910 using that option so far).
But little was known about Chassis 2, though speculation was always that it would be some type of front qwerty device because we knew 480x320 resolution support was coming.
In an interview with Silcon.com, Microsoft's ISV developer evangelist Paul Foster mention this specifically about the second design specifications:
WP7 devices will have one of two screen resolutions - either 800 x 480 for large touchscreen devices with the potential for slide-out Qwerty keyboards, or 480 x 320 for 'BlackBerry' style handsets that can incorporate a Qwerty on the front of the device. Microsoft expects the majority of WP7 devices to have the larger screen resolution at launch, with smaller resolution handsets coming later, said Foster.
Once again, this is not really that shocking and was to be expected (what else could you do with Chassis 2 or 3?), in fact if you go back to February 23rd at CNet, this was pretty much known back then:
Chassis 2-compliant phones will support real sliding keyboards plus touch, the podcasters claimed. They said these would be more Palm-Treo-like.
Sounds like the Dell Lightning, no? Which also explains why that won't be ready till 2011. Now we just have to figure out what Chassis 3 is...that's some real news.