I just prepared a fresh build based on kernel 3.17.4. The biggest difference is that the kernel configuration is now based on Ubuntus 3.16. On the one hand this means many drivers are included that your live system will never need, on the other hand some drivers are known to work better in this configuration. The initrd is now bigger by around 20MB per kernel (kernels are included for 32 bit PAE, 32 bit non PAE and 64 bit). If this is too big for you, tinker around with the kernel configuration for your own builds.
Cairo dock now uses gnome-menus-3. This re-introduces icons and allows a nice search box. A much bigger change is the addition of i3. Start with the additional boot parameter
to start with three terminals in i3: One root terminal and two with normal users privileges. I know there are quite some i3 users out there and I would be happy to hear from you and share your experiences.
Update: I just added i3status and changed the urxvt terminal in i3 mode to a much better readable font.