There has been speculation previously that Mango apps wont be able to run on Apollo-powered Windows Phones, especially from rumour preacher Eldar Murtazin which were subsequently squashed by Brandon Watson. We've been fairly sure (and hoping) that apps would run on the next version of Windows Phone, and now WPSauce has come across a job posting at Redmond that confirms compatibility.
The job description for the position of contains the following:
"Automated testing of marketplace applications written for Mango, but running on Apollo. Write code, file bugs."
While this is further confirmation, we'll have to see what resources Microsoft provide to the developers in the coming months. With the Apollo update (Windows Phone 8) looking set to be a massive overhaul, it'll be interesting to see how the software giant plays this out. Perhaps we'll learn more at MWC.