Cue them saying something along the lines of “our goal is to prevent tracing, not fingerprinting”. But I hope they’re hard at work on a fix regardless.
Tor provides anonymity by giving all its users the same fingerprint. The fact that you're using Tor isn't a secret.
About the Tor version number in window.navigator, I guess they can't easily block it since the browser itself leaks some information via the features added in each release (e.g. a new JS API introduced in Firefox XX).