@HugoMouteira
Thanks! if you mean getting real-time preview for custom high resolution presets on 6D:
6D is more similar to 5D3 and 70D (all of them have DIGIC 5+ SoC), current preview work (in crop mood) does only work on 650D / 700D / EOS M / EOS M2 / 100D (DIGIC 5, without plus) and this due to some differences among DIGIC 5 and DIGIC 5+ families, hence we will need to reverse engineer LiveView on DIGIC 5+ mostly from scratch, and currently I am still in the beginning phase.
I have both 5D3 and 70D, any progress on one of these model will mostly translate to the other two models, if I could achieve something on 5D3, it willl mostly be just matter of copy paste to 6D (due to similarities).
Unfortunately, no one can predict when we will get something working on 5D3, it may take months / years or may not happen at all, so I can't promise anything, but I can say that I am currently working on it.