... is it as good as Symbian?
Developing for Symbian (prior to Qt) may make coders want to stab their own eyes out with flaming chop sticks covered in red hot chilli sauce, but the fact of the matter is that it will take years of MS development time to bring WP up to parity with the features that are available on Symbian NOW, and for some features it will never get there (real time? Battery friendly? CPU friendly?). The only thing WP has in competition (apart from, prior to Qt, not causing developers to self immolate in frustration at the tortuous feats they must perform to get a simple "Hello World" to appear in a little window) is a fancy UI, that in the long term the majority of people might not even like.
Now I understand that Symbian is not nice to develop, or develop on, in comparison to WP, and makes programmers kill their favourite cute puppies by stuffing semtex up their arses, half drowning them in sulphuric acid and then detonating the whimpering corroded doglets whilst feeding them into a wood chipper, but Nokia have just $X billion aquiring and developing Qt on Symbian.
Alledgedly developing on Qt is serene like milk and honey, increases virility, reverses male pattern premature baldness, increases your attractiveness to the gender appropriate for your sexual orientation, increases stamina well past multiple sexual satisfactions and improves the milk yield in goats. Also you can make lovely UIs and applications with it for which your users will forever give you their love, devotion and hard earnt cash unto your wallet, not unlike being an Apple developer (but with less competition in the App marketplace right now).
So: Nokia are continuing on the path of Qt on Symbian for the near term, and there is some risk unto their WP7 plans, not only from competitors such as Android, Apple and Blackberry, but from the very platform they have just killed off -- although note it will only be Nokia employed developers who are suave and hirsute, since all the third party lot will have buggered off for pastures that are not about to be napalmed and paved over to construct the WP7 Mega Mart to which no customers will come. And eventually the goats will stop making milk.
Are the current Nokia plans coherent and deeply considered? Rather less than my own insane gibberings I fear.