Smith and Wesson just released the new M&P Shield.
Just do an internet search using your favorite search engine.

Here is the email link that I received;
"SMITH & WESSON HLDG CORP has added a news release to its Investor Relations website."
Investors - Press Releases - Smith & Wesson

Looks like a single stack,
Each Shield is sold with two magazines, one with a flush baseplate, the other an extended magazine with a grip extension.
In 9mm the magazines hold 7 and 8 rounds respectively, in .40 S&W 6 and 7 rounds.
Regards,
BM1