@Nicholas, No, we don't have a public road map at this time.
@Daxno, Thanks for the additional feedback! There are some merits to having a public road map, but to offer a counter-point to your thoughts on release dates, I found an email from a Firebase member over 1.5 years old that mentioned push notifications being released in the next couple of months. If you had bet the bank on that prediction, you'd still be waiting. Release timelines can definitely be a double-edge sword and it's doubtful they would actually assist you with making development decisions.
The other extreme is that they create artificial deadlines on product features and result in half-baked releases; this is the opposite of the Firebase motto, which is to do the features right and make the API amazing, rather than as good as we can get it "before release." We appreciate both your opinion and your patience with our philosophy.
@Jason, Hi!
Queries are already part of the core product. Could you explain which features you're looking for?