I have sendt a mail to nicehash support. I think I will release my 4.5 MHASH opencl quark kernal opensource for 4BTC. 
(amd r9 280x)
125% faster than the public opencl sgminer version. With some more work I think I can push it to 10MHASH. 10MHASH would be 500% faster than the opensource version.
Rewrite the branching / rewrite pallas groestl to 512 + some tricks from ccminer.
500% would probably cost around 10-15BTC extra to opensource.
(amd r9 280x) 125% faster than the public opencl sgminer version. With some more work I think I can push it to 10MHASH. 10MHASH would be 500% faster than the opensource version.
Rewrite the branching / rewrite pallas groestl to 512 + some tricks from ccminer.
500% would probably cost around 10-15BTC extra to opensource.
I'm curious to see if they give you so many BTCs :-)