A recent talk radio show up here were talking with someone about this. Apparently the big companies out there are starting to go after people "downloading" content.
I am pretty sure they made a distinction between downloading and streaming though. Sounded like at this time they were mostly going after torrent sites first.
My guess is people that use the Android boxes may not get a letter, but they will likely start to see fewer movies and shows as the sites that are hosting the streams will get shut down.
I think I mentioned this awhile ago, in the Toronto area there are a few retailers that sell the typical android boxes, some with subscriptions. Of course there are a ton of them on Ebay, but even at our very large and well known Home Show there are always a couple of companies with big expensive booths selling their own custom streaming boxes. And the line you hear at the booth is that it is not illegal to stream content.