Not really ready for doing that.
A lot of time and effort has gone into coding for a different GPU the MALI most libraries and PI community is focused around that GPU. This boards processor A83T is successfully used in numerous low cost tablet devices in the asian market. The PI community has had a bad experience with the expectation of vendor involved development in a hobbiest market space. The vendors have several versions of the android OS runnings happily on the tablets. This board not so much. If your goal was a set top box or media center than buying a set top box would have been a better choice.
The core issues are the code necessary to implement the full function of the processor is probably not going to be available to the sunxi linux group any time soon. If you understand the hardware and can implement code than this board is a good development chassis to build from.
You will need to down load about 220GB of source code and sift through it to garner the parts needed. If you do so remember to cite the authors as you use the code.
The linux SUNXI group has worked very hard on other chip sets and other products their source code has differences from the debian proper code base.
More documentation is available in chinese and the BPI china forum has a lot of fixes for different things.