Will the Veigar changes be large-scale?
I think big changes to the rest of his kit might be in order. Their reliability hinged on whether or not E hit, making him a real hit or miss champion, and leaving him kind of impotent while it was on cooldown (unless you were a mage and his ult was up, which I think is pretty lame)
I think instead of exacerbating his reliance on his E, I think the rest of his skills should be made more self sufficient, with his cage ending up as more of a catching/teamfight/offensive move, where the objective isn't solely focused around them touching the walls, and more of a "YOU'RE TRAPPED WITH ME 8)" move
And his ult could definitely use some touching up. I don't like the anti mage aspect, and that power can be moved elsewhere imo
Also, just for fun, here's a rework I envisioned a long time ago before the E and Q changes. http://boards.na.leagueoflegends.com/en/c/skin-champion-concepts/69Uf7cBE-veigar-rework It's slightly a joke, but some of the concepts sound fun (in a vacuum. in a teamfight they'd be op)