I would say they will go up for pre order. They may even go up this month. There are Mattel pre orders slated for February 20th, which is after Toy Fair. Maybe that's the day they will go up for pre order. No confirmation on that, just possible. But no matter what I'd say these, and the kids line The First Ones will all go up for pre order before the April 25th release date.
I really do wonder if their scale is really smaller than the Masterverse stuff. Saying "1/12" doesn't really mean anything anymore - these days, lots of lines that are much closer to 1/10 claim to be 1/12. So definitely curious to see some in-hand pics.