It's the first non-trivial one, but not the first entirely. The patch set I believe comes with a simple NVME driver to prove that the system itself works. I'm curious if we'll see some network drivers ported to it because of the concurrency and memory management benefits. They tend to be just as performance sensitive as GPUs and even more security focused since they pretty much explicitly handle untrusted input (externally and internally) in ways that lots of devices don't do.