Agreed. I think it makes perfect sense to have a phone that can plug into a tablet or any other form factor. The thermals might not let you run an iPhone-in-tablet as fast as a dedicated iPad, but given how fast their chips are getting, it's probably just a matter of time.
But Microsoft have no phone offering. And if they release a new phone, as a an ex-hobbyist Windows Phone developer who experienced all the consumer and developer hostile moves (no upgrade from 7 to 8, numerous lies, etc.) I'll be very reluctant to target this platform again. Other devs with experience on the previous phone platforms will probably have a similar view on the matter.
