Dont think HK is in a hurry to make any semi it is basically a variant of the HK433.
in 300blk I still think SIG spear MCX or whatever they call now makes the most sense. Compact, small foot print and light. Most others like CZ and HK are bigger in foot print than the SIG.
On another note, I really like the Beretta NARP. That is the goat. Everything I want in a rfile....if suppressor is available.