I'm looking forward to playing D4 but I'll wait till the first DLC get's released and Blizzards offers a cheap bundle, so maybe in 2 to 3 years. Then we'll also know how much the MTX affect the game.
In the mean time there are enough other great games waiting to be played. I haven't started the Mass Effect trilogy but heard good things about it, also in about 2 months Baldurs Gate 3 will be released and I am thinking about playing the remastered versions of 1 and 2 before