Symmetra will receive a new voice line for the planned rework coming to Overwatch soon. 

This makes sense as she has plenty of changes coming and a drastic one focused on her ultimate. She's had problems for a long time and always has had a difficult time fitting into any meta. Even Jeff Kaplan knew that she needed to be changed since she struggled as a support and offered no healing. Symmetra clearly needed to be a defense hero.

Now that her ultimate is a massive barrier, it's only right that she receives a new voice line that fits her abilities better. She can even use the teleporter as an ability. We might see quite a few new voice lines by the time she comes out!