This will open up a big new market for zencash, being on bittrex is huge but it doesn't have a great base in Asia and China specifically, OKex will offer that and if Chinese investors get on board we could see a nice increase from this news.
I don't think that OKex will make a great impact.
Zencash is already having over 4M daily volume on Bittrex and Upbit.
This is not a buying news.