The latest work on Weston's tablet-shell is by Tang Ning of Intel with a set of 19 patches that drop in more than 1,600 lines of code for adding new features.
"This time we added multitask feature and spring effect on sliding layout. The spring effect will reduce trailing caused by rapid mouse dragging. Using key binding super + tab would switch between clients, an event would be sent to client to let it free resources and it won't be drawn. Your feedback and opinions will be appreciated." With the motion handler, sliding effect, there's a task manager and other new work introduced as part of the 19 patches.