I'm not going to claim that the the current status of Viktor on the PBE is good. As it is when it goes to live Viktor's performance will drop. I actually do like the direction of the new death augment as it actually has the potential to add something to his kit instead of being "insert damage here".
The change to his E augment on the pbe I would like to see is an increase in the time the aftershock can apply damage, something as simple as making the aftershock linger for .25-.5 seconds and do damage once to anyone entering the area. Combined with the increased projectile speed this would make afershock a much more reliable zoning tool.
His ultimate needs some more touch-up but otherwise I like the direction it's going in, although I do not understand why such a massive delay was necessary seeing as how all of his 3 seconds of total possible cc can only hold someone for 3 seconds. This means that If Viktor ults immediately when someone is inside his gravity field he will have 2.5 seconds for his ultimate to be down meaning it will only get off one tick reliably.
225/400/575 + 105%ap -> 250/425/600 + 110%ap (in 2.5 seconds) Never mind everybody I did the math his ult is fine as long as they're cc'd it'll just feel bad anytime they aren't.
All together Viktor will be just as good if not better at deleting people if they're cc'd (basically anyone cc'd around Vik may as well just open up shop) but his burst will now take 2.5 seconds to delete someone. However without this CC Viktor will be incapable of reliably doing anything; Viktor will rarely be useful against anyone who isn't cc'd or weakened. Oh look, Viktor is now better balanced as an assassin than every other assassin.
On a side note I'd really like a change to Viktor's Gravity field augment the current one is just kind of there. It's not bad but it doesn't really add anything. A better augment would be something like Poppy's W making it so that it could interrupt dashes. This would be a considerable power increase on his gravity augment but it would also give you a reason to want to get it as currently I've had gravity field pull enemies out of skillshots more often than I've seen it assist my team.