Microsoft’s response to Ed Bott’s question regarding Windows Phone 7 Updates:

Microsoft will push Windows Phone 7 software updates to end users and all Windows Phone 7 devices will be eligible for updates.

I seems that Microsoft has learned from the mistakes they made with Windows Mobile and the mistakes Google has made with Android. If Microsoft keeps their tight control over hardware specifications, all Windows Phone 7 devices should be able to update to future versions of the OS. Windows Phone 7 users should be much happier wi their purchase knowing this.