The USP .357 sigs are out. They've been out for over a year. In my area they haven't sold well because of the price. They are about $50-60 more than the 40S&W version.
Also, a downside to them is they don't have the ability to switch calibers like the Sig 226/229/239/2340 do.
Brokenarrow,
I talked to an HK rep at the SHOT Show about the rumor of .357sig MP5 and he advise me they have several functioning prototypes. Unsure if it will ever make it to production though. I hope it does, would make an excellent subgun.
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John
"Never argue with an idiot, they pull you down to their level and beat you with experience"