I recently took my 70-410 and used itpro.tv as a supplement to my textbook study guides. When taking the test, I realized that there was A TON of PowerShell questions, and there's no wonder why, either; Microsoft put a lot of work into making the newest iteration of PowerShell actually powerful.
Perhaps you guys could dedicate a few videos solely to managing roles and performing common tasks through Powershell? Perhaps a mini-episode dedicated each to managing DNS, DHCP, ADDS, Hyper-V, and other common administration tasks strictly from PowerShell? It may not be super heavily used in the real world, but it is definitely an enormous part of the exam itself.
P.S: For anyone who wasn't aware, the 70-410, 70-411, and 70-412 all switched to Server 2012 R2 as of March 15, 2014. I did not realize this until I went to take the test, and wanted to make sure people knew this beforehand to prevent any panic attacks in the testing room.