For now no plan to export in USD.
The format is very complex, for example forger and blender can’t import USD.
There are also other things that I dislike (USD library that is not straightforward to build, required TBB and Boost, etc).
In theory you can export without Pixar’s library, but a quick look into the library makes me think it’s not an easy breeze.
So I prefer to wait a bit before looking into it.