I was wondering if SESI is planning to/working on nodes that can import and export glTF 2.0 files, including animations? This would be very useful for game dev because it supports material connections and it's more optimized than FBX.

It's hard to know what their plans are, but the best way to get SIDEFX to know yours is to submit an RFE.

I too would encourage to RFE this.
Several RFEs from different people are already in effect, and detailed request lists both on the regular and also on the beta channels have been made. So far, they seem to have been.. not the highest on the priority list. Adding more voices to it would definitely put more weight behind it.