(I don't have any source so what I am typing is just my thought.)
I am sure more will be imported, but when, we will never know. My reason, 1. The first 300 were imported last year and we thought that was it. 2. There are 7.62 X 39 in different barrel lengths from DL supplies on gunbroker for the past couple of weeks. " unless those were the early 300, which I really doubt". 3. It is CZ, it is $$$ $, CZ will always have some contract that ends up unbalance. By this, I mean where supply ends up more than demand ( remember the P01 OD green), so unless our law changes, CZ will be more than happy to dump surplus stuff on one loyal US importer imho. 4. Most CZ rep doesn't have a clue, just like cz as a whole don't either.
** I am in no way saying your piece won't be valuable or appreciate in $$$$, just saying thinking it will never be imported might be over-exaggerating the situation***