A few RIM engineers are one deck at the Droidcon event held in Romania. They explained there will be a few restrictions on apps that can run in the Android app player. According to Thing:

Key features which will be unavailable to Android apps running under the compatibility layer on the PlayBook and future BlackBerry devices include Android’s famed battery-sucking Live Wallpaper, SIP and SIP VoIP, anything built using the Native Development Kit, apps containing only App Widgets, and apps containing more than one activity tied to the Launcher.

In addition, any packages which rely on Google Maps, in-app billing services, Android’s text-to-speech engine, or the cloud-to-device messaging system will all be rendered unusable under the company’s runtime system.

Apps with in-app billing are quickly becoming the status quo, as that’s the best way for full profit potential. Take this news for what you will, but I cannot see there being that many Android apps becoming available given the many restrictions. Nonetheless, the PlayBook will still get a decent bump in app availability with the use of the Android app player. Let us know in the comments if you think this is good or bad news!