The biggest feature I will be looking for in this is a true push to android mobile devices. It looks like you can use the subscribe function for this, but I'd need an android example to get up and running quickly. Right now it seems like firebase is the only game in town for that functionality unless you want to roll your own with websockets or some sort of MQ. Google also strongly encourages use of firebase for that in the TOS in the play store I believe. I'm very excited to see how this progresses.

I also went right to the pricing page to see if you would charge for on-prem hosting, but looks like it is still TBD. I would like the ability to host everything on-prem. Security and encryption would be next on my list of wants after that.