I specialize in AV and see a Great opportunity here. I work in a mid-sized low budget University. A Roku sound bar can replace a number of items in a Classroom installation.
With the ability to use both Miracast and Airplay there is no need for cables from devices. The sound bar (If Loud enough) means there is no need to for an amp and ceiling speakers.
What I would mainly like to see is a few settings that would eliminate the need of a remote and prevent someone from taking over the device if it is already in use.
If Roku could create a couple device specifically for "Commercial use", I believe you could have a great impact on the Classroom of the future.