Hi-DPI display support
Status: In progress
Make GNOME work well on hi-dpi displays such as the Chromebook Pixel. This is done by implicitly scaling all output by a factor of 2. Applications mostly don't have to care about this, they operate in 'abstract pixel' space. The bulk of the work is happening in GTK+.
GTK+ team, gnome-shell team, cairo developers, artists
The GTK+ changes are almost complete in 3.9.10. The GTK+ changes require a new cairo API to have any effect. This is not available in cairo 1.12. The needed changes are in cairo master now, and will appear in 1.13.
705409 Scale cursors
705915 Add hi-dpi support to clutter
705412 Draw hi-dpi versions of many (all ?) icons
How you can help
If you have a hi-dpi laptop, try it out according to the instructions at https://mail.gnome.org/archives/gtk-devel-list/2013-July/msg00007.html, and report any issues you find.