Good luck with the new boards! I bought most of my SBCs one year ago, but so many more have been released since then. It's hard to keep up.
I'm looking forward to your follow up post. If you have issues running Android, TN-Grid supports Linux on ARM while avoiding GPU competition. It might even offer more magnitude than Universe@Home right now.
I've moved all of my x86 machines to WCG, but have held off on the SBCs because I didn't want to mess around with Android. I tried to install Android once on one of my devices, and I ran into problems and gave up :-)
RE: More SBCs On Their Way - BOINC