Among the improvements made to Canonical's Mir Display Server for Ubuntu is Android Ice Cream Sandwich support with HWC 1.0 compliance. Support also landed for surface states and software cursors. Input support is also now fully enabled by default. There's also been LightDM integration work and clean-ups, basic Android/Display logging support, surface improvements, and supported Unity integration on Ir, creating a Unity-Mir layer.
In terms of Unity 8 happenings, there's been a spectrum of ongoing work but nothing too particularly thrilling for Linux enthusiasts this week.
The Unity 8 / Mir status update for the past week was shared on the ubuntu-devel mailing list.