I too would love new heroes in the support, then rather moving heroes around, except for Symmetra, I’m bias for her to be support again so I can play her more, the DPS queue killed her for me a little. Waiting for ever just to get a match that’s halve the time I queued for 
But this is a selfish wish of mine 
But I would love it if they tried Bastion Tank and Sombra support, as I genuine think they would bring something cool to these roles, Mei as well as a tank. But that’s why I would rather see these or something similar as a experimental card, we have already tried Mei and Symmetra (though the Symmetra changes had some potential but they didn’t push it far enough I think 
), maybe they would work, maybe they wouldn’t, testing is always nice 
My ultimate wish actually would be if they reworked the Custom Game, added more sliders and boxes that changes functionality on heroes weapon and abilities (like primary fire hit allies and heal them), allowing me to turn any hero into a support or tank (though tank we can kind of already do, with health sliders and such).
Thanks you’ll for giving your thoughts here 
/xoxo