Ashley Eckstein spoke to IGN about Ahsoka having a confrontation with Darth Vader in Star Wars Rebels and what that would mean for her character:
I still wonder if Darth Vader is going to try and kill her outright or convert her first? Both rejected the Jedi Order for similar reasons (albeit with wildly different outcomes). Still, the former Jedi is a threat and a rebel now.
Thanks to Woo S! Kim for the heads up!