Actually Microsoft has not abandoned WinMob6.5. They have repositioned it as a platform for corporate users and there are millions of handsets shipping with it right now. It's a shame that Adobe has given up on its efforts to get Flash on this platform. Granted, business users may not be the ideal target for Flash content.
On the other hand, the shiny new Windows Phone 7 series that was shown at Mobile World Congress and at MIX10 earlier this year is targeted at consumers. It has Silverlight at the core of its slick UI.
I think it makes a lot of sense to have Flash Player in the browser on these consumer devices, however they won't be out until the holiday season this year I guess. Maybe Adobe don't want to stretch their resources too thin and are targetting only the most recent consumer-oriented devices.
I would be curious to know whether there are plans to bring AIR to WP7 too?
My bet is that Microsoft won't let that happen since the "native" app development environment for WP7 is actually Silverlight / .NET ...
Adobeans: any input ?