I got this from Bittrex :
"Apr 11, 07:46 PDT

Hi,

We are looking into our options with zcl/zen but do not have any concrete decision yet. The new site is coming in a month or two.

Thank you,

Ryan @ Bittrex"

Little off topic: I originally asked why they removed "TOP 50 wallet distribution chart" section from their site as I found it extremely useful to monitor what bigger wallets were doing when trading smaller coins sometimes only listed at Bittrex. I was also worried that there had happened something and they are now in need of hiding wallet distributions. But apparently this was done ahead of new site launch which should be in following months without further explanation.