Sounds like gun dealer gossip run wild to me. If S&W was going to bring a substantially altered new model M&P to the market. The Soonest you'd hear about it would be the SHOT show next year and then it would be another 4 to 5 months before they became available.
S&W would have to be out of their minds to risk a redesign of the M&P series right now. The current M&P's are going like hotcakes, have extremely good press and word of mouth reviews and are poised to finally return S&W to the top of the American Firearms market heap...Why in gods name would S&W risk destroying all of that with a new design that could have hidden flaws?