During the unveiling of the Windows Phone 7 Series, Microsoft recognized that one size doesn't fit all. Some Windows Phone users prefer sliding keyboards, some prefer front facing keyboards, and some would rather see a larger screen and no keyboards. Some hope Microsoft keeps the door open for such design variations and a recent podcast from Australia is suggesting these options may be more than just a possibility.
In a recent "Frankly Speaking" podcast, hosts Michael Kordahi and Andrew Coates suggest that Microsoft may cut back the number of Windows phone designs to three styles or chassis.
Chassis one would resemble the “big touch screen” phones similar to what were used to demo WP7S at the Mobile World Congress. Heck, it might even include the HD2 if an upgrade is made available.
Chassis two would incorporate a sliding keyboard into the design and Chassis 3 might be a candy-bar styled phone with a front-facing keyboard.
Keep in mind this is all speculation but having a choice on styles could make a lot of consumers happy and still maintain the consistency Microsoft is hoping to achieve with Windows Phone 7 Series.