Treat this with all the usual caution that comes from questions asked of customer service representatives, but we're getting reports that the Transformers Kre-O line may not be continuing in the US.
Christian Flores of the "For Kreon Out Loud!!" group on Facebook
asked the question of Hasbro's customer services, and got the following response:
Regrettably, our Spring line of Kre-O Transformers are not scheduled for release in the United States. They will only be available in Canada at this time.
The two important things there are that this only extends to the Spring line of releases - so future ones may come out - and also, the qualification "at this time", which does not rule out the possibility that plans may change.
However, for the moment, it looks like Kre-O is headed for a time out in the US. This writing has been on the wall for a while, with more recent releases being slow to appear in retail, if they've shown at all.