Xfwm4 4.12 Roadmap
[FINISHED] Smart placement optimization
The smart placement code has been optimized to check for the least covered area to position a new window in less steps. It also aligns the window next to each other instead of the random gap.
[FINISHED] Tab window improvements
Improve theming support in the tab window, allow different layouts and possibly mouse interaction. Various designs are being considered in the design sig.