I'll grant you, it walks a line. But if you look closely at the letter, there's not much in it that isn't already publicly available. We know MTP is trying to sign a major act in the next few weeks (we even know the size of the venues they are focussed on and have hints of who that act is from Twitter), we know they are producing at least one film (actually, they are looking to produce several) and we know one star who has joined the project, and while I don't like CEOs telling us a PR is coming, it is legal to say one is coming so long as he doesn't say what's in it.
I like Mark's affirmation of his philosophy and the warning that this is not a get rich quick scheme (at least on the days-to-weeks time frame), and a little rah rah about the long-term potential is just fine with me.