Even if they get h264 decoding working, its going to be a huge win for allwinner community.
Having a working h265 isn't really all that useful to be honest, since the common chips (H3,H5 etc) only support 8 bit decoding, while most media i came across is encoded for 10 bit.
h264 media on the other hand is still widely available, so having mainline support would be awesome. Now if someone would get this working under chrome or firefox, that would be a different ballgame