One fork in the road may be a single platform for Windows Phone & Windows 8 apps, or the ability to run WP7.5 apps on Win8.
Which would be nice. Kind of like running iPhone apps on the iPad.
The star of last year's product roadmap was Office 365. Microsoft this year looks likely to pivot from the public cloud to the private cloud, while also shipping staples like SQL Server and releasing major betas -- and possibly final versions -- of blockbusters including Windows 8 tablet, client and server, and Office 15.