all the latest news from bittrex are here https://support.bittrex.com/hc/en-us/categories/202219128-Coin-Information and here https://support.bittrex.com/hc/en-us/sections/203283828-Information . You must follow them for latest announces. In the right corner of the second link you have the follow button. For more clearly answers about the forks you must make researches..