This magazine is part of a grand initiative by AMS to raise awareness of Montessori philosophy across the country. It coincides with the 100th anniversary of the first Montessori 'Casa' in San Lorenzo, Italy.
Schools are being invited to 'ride the coattails' as it were, banding together to pay for a huge blitz in advertising and media information. The M:Montessori magazine is an effort to get good quality, clear information out to families of Montessori students. If your school is handing out these subscriptions, it means they have joined the initiative. This SHOULD be good news, as they are more likely to be in step with the true Montessori philosophy. I haven't personally seen the magazine, though (I don't think it's out yet), so don't know what the articles or information will be like.