The image for RPiBuntu 15.10.1 is now available here.
Besides up-to-date package versions, this image contains a new U-Boot version with patches for HDMI output, two mechanisms to recover a non-booting RPi2 and experimental splash image support. See the U-Boot documentation for more information.
The MD5SUMS and the script to create own images can be found on GitHub. If you find bugs or have any problems, please open an issue on GitHub.