While most leaks concerning the Lumia series fall under the purview of Windows Phone, a recent rumor by @evleaks suggests that Microsoft may be considering launching a Lumia branded handset that runs on Android.
There is no further information regarding the handset, when Microsoft intends to launch it. Nokia had previously launched Android powered handsets under the X series, but those devices ran a forked version of Android with Nokia's own digital store in lieu of Google's services.
Do Lumias running Android exist? No doubt. Will they actually make it onto shelves? Honestly, I don't think anybody knows for sure at this point. The Nokia X is weird enough as it is, and I wouldn't be surprised at all to see Microsoft releasing an Android Lumia. If they do, however, the real question is going to be if it'll come with the suite of Google applications, or with nothing but Microsoft services - greatly reducing its usefulness, at least here in the west.
I'd be very interested in a Lumia running Android, but only if it's got Google services. I don't think we need another Frankendroid.