Intel's basically the only company that has been formally investing engineering resources to work on upstream Wayland (compared to Canonical's hopes of seeing things done for Ubuntu, et al, but patches have come to Wayland from Red Hat, among a few others). For the MeeGo project there were several Intel and Nokia engineers working on Wayland, then Nokia parted ways, and Intel hired most of the Helsinki engineers. So what's up with Wayland now that Intel is transitioning to Tizen?
From what I'm told is that there isn't any significant impact and the Wayland engineers are basically their own team now at Intel. Intel is committed to Wayland. The Wayland developers aren't directly under the MeeGo/Tizen efforts nor are they reporting to the Intel Open-Source Technology Center (OSTC) developers working on Intel's Linux graphics driver.
The Intel Wayland team is led by Kristian Høgsberg, the creator of Wayland that was working back at Red Hat in 2008 when he began work on the project and then moved over to Intel. Other developers on this new Intel team are Tiago Vignatti (former Nokia engineer), Ander Conselvan de Oliveira, and others. Juan Zhao of Intel OSTC has also been active recently on Wayland development.
Hopefully we will see some good progress out of the Wayland Display Server in the near future. See the other Wayland articles on Phoronix for many more details as to its current status and milestones.