It's been a while since Avatar came out; it's even steadily falling down the charts. I personally loved the movie, and the Na'vi conlang only heightened my suspension of disbelief.
There are bits about Na'vi leaking out slowly but steadily. For example they have a base 8 system, which makes sense because they have 4 fingers. And it seems fairly regular if you don't have a problem speaking in 8s instead of 10s.
I'm still waiting for a Na'vi language book. They made the field guide, so why not?