Supposedly she will be similar and perform the same role but her kit is being restructured. As it stands she is the only character that straight up stops building ultimate at a certain point. She needs a change to her teleport, either two ult or something else. Her turrets leave something to be desired as well.
Still think they should just copy Combat Girl's kit from Super Monday Night Combat. She was fun to play and lines up enough with Symmetra that it wouldn't feel like a totally new character (imho, of course).