Supposedly, this is how it works. The length of the cover is extended and will be folded into the magazine. There will be three groups in this triple-length cover. KisuMai, A.B.C.-Z, and Nakayama Yuuma w/ Hey! Say! 7 West. Yes, all three groups, so no wonder they need a fold-in cover. They'll never fit that many boys on the cover. Anyways, the apparent order will be KisuMai -> A.B.C-Z -> HS7W.
...meaning the true cover will be KisuMai!?
The units on the cover were announced on Johnny's Net, however the way the cover will be was posted on various blogs (and that's how I found out), so there might be changes, whatnot. Do not blame me if the cover turns out differently. Just, for sure, these 19 boys will be on Wink Up's cover.
As well, I'm thinking most of us are familiar with Myojo's Jr Ranking that happens every year? Readers basically vote for the Junior they think will fit into each category, such as most wanted lover, seem to be smart, most perverted, etc. The results were part of Myojo March 2009.
I have all of Taisuke's results here and Hiro's + Wataru's results here. Note that these results were found through the Internet, not through an acutal copy of the magazine, so please do not ask me for the full ranking. I don't have it.