I also have a slight suspcion that Lami (former SM ROOKIES) is going to debut with this group
Here's the weird thing.. I've seen her concept video, it used to be on IVE's youtube channel but then they privited the video.
Here it is in my recommended searches
and then you can see right here that the same video has been privited
Basically, what im saying is that Lami (yes, from SM Rookies) is going to debut in IVE. Her teaser was probably uploaded by accident or something, but yea.