If I remember right, the guy, who made campaign of tablets with QML based DE long time ago on TMO and as far as i remember(I might be wrong) was involved in mer or it was based on mer, now have few interesting projects
Qt(QML)+Wayland and all this have pretty nice UI already. It's all opensource and on github (btw maybe worth to open new thread for that one). anyway here are projects:
http://www.maui-project.org/
http://hawaiios.org/