Always excited about VUs. I can't help but talk about them. So I decided to just post what my guess has been
I say maybe:
Singed (I see 1 & 2 swapping)
Twitch
Taric (3 & 4 can be swapped also)
Karthus
PS. Cant wait for an eventual (hopefully sooner rather than later) Kassadin VU and Jax VU
Edit: Didn't mention Sion because he's getting a whole rework. Riot said it'll be a while till he's released
RiotIronStylus7 votesYou've got some good contenders here ;)
Garentheon1 votesHehe Just a lot of 'putting two and two together'
AbiwonKenabi2 votesI suspect Sion should be somewhere on that list, though all these champs seem pretty likely. Sion VU is dependent on how quickly they can settle on an agreeable kit, but I'm pretty sure he's the one they are focusing on the most. These others already have solid gameplay, so I'm sure Sion will just be put in there whenever he's ready.
Garentheon2 votesTrue. Didn't mention him because he needs a kit change
Remlap12231 votesSion is getting a complete reboot. On the lines of Karma and Trundle in terms of change. The VA is part of the package.
DomoSapienXD2 votesRyze has his models already made. He'll be our next VU.
Garentheon2 votesWanna wager on that? lol
DaGoldenFlamingo2 votesI love how the Donger's VU is, and I'd love if the next VUs were Poppy or Ryze, but if I remember correctly someone said Shaco was on the top list with a few other champs which I can't actually remember.
The champs I'd like to see the VU are: Cho'Gath, Evelynn, Caitlyn (Really excited to see her more Piltover-like), Warwick and Poppy. Still, I'm always excited for new content and can't wait to see all the new stuff they are preparing for us.
Neamean2 votesyay for 
, but i honestly want one for 
more
EpicSmurfAccount2 votesI'd say something clever and cheesy like 'The Answer is always Karthus', but I'm an avid AD Carry main and Riot handled Sivir's VU beautifully so I hope -for my own selfish reasons- that Twitch is next up for a VU.
That said, I do enjoy a nice Singed game every now and then.
EDIT: By selfish reasons I mean my sneaky investment in Legacy and Limited Edition Twitch Skins knowing that he is somewhere on the VU list.
Garentheon1 votesLol I id the same. Got a bunch of legacy skins hoping they'll be all awesome and exclusive after a VU. Didn't get twitch because I don't adc
EpicSmurfAccount1 votesI'm proud to admit that I got every Limited Edition and Legacy Skin for my AD Carries that I can so far.
Garentheon1 votesWas going to get kingpin twitch and safari caitlyn but then i remembered i don't adc lol. But I got festival kassadin and a couple others. Have no idea what festival kassadin will end up lookin like
XdeathscyX1 votesIRONSTYLUS when i go to the loading screen and wait to go in game then it goes black and it said your firewall has some problem or whatever so i did everything but it didnt work and my friend lost my series!riot only has one game game and you cant even handle it.i lost all of my league point and plus i was reported because i cant even load in your gayass sever or shit. **** all of riot employee waste my time waiting to reconnect your all pure *******!fking 3 days already look at my match history all the leaves goodjob pure failure!this forum doesnt even help!
Garentheon6 votesTake your rants somewhere else. VU talk only
daft inquisitor6 votesRight, because someone on the art team can fix connection issues. GG bro.