Meh, I just got a brand new Performance Center M&P40 Shield 1.0 back in January, and I'm satisfied with it. 7+1 rounds of .40 S&W is adequate for my needs, and with so many politicians lobbying for a reinstatement of the Assault Weapons Ban, I'm not going to buy a new carry gun which holds more than 10 rounds by default, I'd rather carry a subcompact that holds 10 rounds flush-fitting magazines, but can take full-size magazines like the M&P40c.
That being said, if they release an M&P40 Shield PLUS that holds 10 rounds, then I'll consider it, but seeing as S&W usually likes to design their pistols for .40 S&W first, then modify it for 9mm Luger since that works better than the opposite approach, so I doubt that there will be a .40 S&W variant released down the line, but I'm okay with that.
If I really wanted my Shield to hold more rounds in the magazine, then I'd buy a Magguts Kit and an extended baseplate.