Well today's the day MS are planning to get back into the mobile OS game. WinMo has been serious stuck in the last gen on Mobile OS and has been blown away by Android, palm and mainly iPhone.
The first sneak screens seem to show Xbox Live integration and a much more touch friendly interface. http://goo.gl/9lRv
So hopefully they can throw a spanner in the works. Hopefully they have seen what the other do welll and what they don't do so well and come up with something great. Personally I would like to see:
An Open App Environment, like windows, development should be open to all and access to apps shouldn't be restricted to a moderated store.
Simple but capable UI, iPhone does great UI but if they can extend that to more complex tasks like multitasking that would be great.
Scalability - iPhone OS and Android are both being used in tablet devices, I think to be a contender it may have to scale up too.
It all kicks off at 2pm.