This is pretty good news: Nokia, who acquired Bell Labs a while back, handed Plan9 to the new Plan9 Foundation, which released it under the MIT license. Even though it has little practical use these days, this may rekindle interest in it.
I dabbled with Plan9 for a while and had a Raspberry Pi booting it regularly until not too long ago. I am also still on the mailing-lists… Let’s see what happens.