Looks like the Bumblebee Movie Tiny Changers are already almost out in stores in America, with that product found to have reached distribution, which is said to be about 2 months before products end up being found at retail.... which puts these as being out around April/May.
That probably would have been the original release date, before the Movie was pushed back, but I guess Hasbro were going to release them on schedule anyway, to keep that size class out in stores (after the two waves of TF5 figures were released about 8 months ago).