Assume that I am creating an app that I want everyone to be able to enjoy. So I launch a 7.8 version. However, in the 8 version I want to implement 8 only API features. How are you supposed to submit this to the market? Am I supposed to do a single submission with multiple apps? Two separate submissions? Or is this practice not allowed? Please keep the snarky comments to a min. Thanks!
According to this blog by Bernardo Zamora, the Dev center does allow multiple XAP files targeting different versions of the Windows Phone OS.