there is a high chance bittrex will support the next fork because they shown support in both hardfork. yobit might support again in this fork since they supported last fork. for me the best place to store btc in the next fork is coinbase if bittrex will not support the fork.
As Far as I understood, Bittrex decided to support the fork... Good news.
But it is too late, because I migrated my btc on Coinbase.
Coinbase guarantee to me an Euro Wallet useful in case I decide to stop my trading activities.
So I choosen this strategy... Thanks for your support.