A request to add DBIX was submitted to Bittrex a month ago and a considerable amount of time was spent working with their Staff attempting to get it added. They can't comment on the status of any Coin or if or when it will be added so its a wait and see at this point. However they historically like to see huge community demand through Twitter campaigns involving multiple accounts that are cleverly executed and not spam. Something like that community driven would increase the chances of getting DBIX added and possibly shorten the wait time. Although from a logical standpoint they probably will want to wait and see how the Hard Fork goes and test the Block Times over a reasonable number of Block emissions in order to come up with a realistic average which might take anywhere from a few hours to days after the Hard Fork along with performing a full evaluation of the necessary  features added plus overall functionality of the new Block Explorer that the DBIX Programmer recently mentioned they were building.