I feel like Syndra could use an entirely new ult
Syndra's kit is about manipulating her Q, and her basic abilities pull that off in a really interesting way. Her ult, however, is just an obscenely powerful point and click nuke, so her E is the only skill she has that actually cares about the positioning of her spheres.
I think she could have a much healthier kit if they gave her some more interesting kind of ult. The easiest idea would be a short line skillshot coming from each individual ball, though I'm sure there are totally wacky ideas I haven't thought of. Not only would a change like this make her kit feel a lot more interesting to play, but it would fix the biggest balance issue she's had in the past, which was the fact that her ult was literally just a targeted free kill at level 6. They could also afford to make early ranks of her Q a bit less worthless if they took a bit of power away from her ult.
I hope they at least consider this. I really like Syndra, but she really won't be a balanced champion while she has an ability that can easily do 450 (+ 100% AP) damage as a targeted ability with reasonable range at level 6. Either she'll be broken because of it, or the rest of her kit will have to suck.