GPS for both might also be an issue.
I could also see this being used in other fields (such as military) where there would be advantages to isolating important applications in their own OS environment and being able to have another that would act as normal android (web browsing, communications, smaller apps).
This sounds pretty cool to me because the company I work for recently changed their Google Apps account to us Google Apps Device Policy, which gives the company privileges that allow them to examine and remotely wipe the entire phone. I've chosen to go without Google Apps access on my phone rather than approve those permissions.
I'd much prefer accessing business-sensitive data within some kind of container or sandbox my employer controls.