Looks like someone at Target had a change of heart about Generations since Toyfair in March... or someone at Hasbro managed to do some sweet talking to convince Target to take on the line (to go with Metroplex).
Could it be something to do with sales on Beast Hunters being pretty good? Certainly following the toy sale my local Target is all but picked clean of deluxes and voyagers, and only has 2-3 Ultimate Predakings left, with OP having sold out!