So we will see 4 new champs and 6 VGU's this year... Lets theorize
first of all, for the references, I used spiderexe's thread with the help/confirmation from reav3 and other rioters. here
Along the way, I also come across some hints from the designers and some clarifications like xenogenics champ will come first before august.
So lets start( In order ):
1st - wav3break - VGU - Swain, which will come in a couple of days :) - Prediction Patch/Month in Live Patch: patch 8.2/January
2nd - RiotJag - New Champ - New ADC champ confirmed - Prediction Month in Live Patch: Late February
3rd - RiotSolCrushed - VGU - Irelia - Modernization like warwick - Prediction Month in Live Patch: Late March
4th - EndlessPillows - New Champ - No hints yet - Prediction Month in Live Patch: Early April (back to back patch reveal?? nothings impossible)
5th - RiotJag - GU - Aatrox - Biggest GU to date - Prediction Month in Live Patch: Early May
6th - CertainlyT - VGU - A top/jungle champ - Prediction Month in Live Patch: Late June
7th - RiotSquad5 - New Champ - No hints yet - Prediction Month in Live Patch: Late July
8th - Xenogenic - VGU - No hints yets - Prediction Month in Live Patch: Early August
9th - RiotAugust - VGU - A girl champ - Prediction Month in Live Patch: Early September
10th - RiotWrekz - VGU - Diffidently not Nunu ( I'm so sad about this one) - Prediction Month in Live Patch: Early October
No Novemeber. Pre-season stuff for the luls
11th - RiotSolCrushed - New Champ - In early ideation - Prediction Month in Live Patch: Early December
VGU Preditions with
:
in order:

Dream champ designers to do in the future:
RiotJag - Do a rework for Kayle RiotSolCrushed - Do a rework for Fiddlesticks/Morgana CertainlyT - Do a rework for Dr.Mundo or Rammus. No new champs just VGUs please! RiotAugust - New champ jhin level
(not necessarily in this order).
will be getting a new skin in the next two months and that will create waves of saltiness deeper then the ocean [zombie-nunu-bummed] - fingers crossed it’s about her splash update.
Nunus presence in wda does point to him perhaps getting a new skin which would put the kibosh on his vgu being this year or even early 2019- again I can only imagine the complaints, especially from OP [sg-miss-fortune]
Ionia and Noxus are highly likely going to be the regional updates of the year along with some mini updates coinciding with the other new champions and vgu
And with the promise that we’ll get a full map of valoran, the southern continent and Ionia we may see new regions being introduced.[sg-jinx]