The original plans were presented by Debbie Beliveau and Michael Frey. If you want to know what happened to their plans, you'd probably do best to ping them an email. Most Ubuntu developers don't bite and I'm sure they'd be happy to explain.
Actually, I'm curious about this too, so I'll send them both an email now. I'll post back with any response.
There have been rumblings of activity elsewhere since in other distributions but I've never seen anything as positive as the UDS presentation a couple of years ago.
There is a way to run some Android applications inside Ubuntu: you install the Android software development kit and run applications on a virtual device. Far from perfect but perhaps enough for simple needs.