No, that’s not confirmed at all.
Just because it is a “straight beam” does not mean it will function/look exactly like Zarya’s. They will want to seperate her from other characters.
My guess is it’ll function more like Moira’s beam, that only “shows” when it’s on a target. When not on a target, it’ll function similarly to how it does now with the spinning animation and will pick up objects.
I wouldn’t go throwing around claims yet. Just wait until the rework hits, then complain.