Shane Buettner, in his UltimateAV www.guidetohometheater.com
reviews of the Marantz VP-11S1 and VP-15S1 said that he could easily live with either projector forever. Dan is merely agreeing with a noted reviewer. I am sure there are plenty of other people who agree, too.
From Shane's review of the VP-15S1:
"Even in this market it's worthy of its price, and another [the other is the VP-11S1] Marantz projector that I know I COULD LIVE HAPPILY WITH EVER AFTER."
As for your question as to whether Marantz told its [presumably prospective] 11S1 customers that the 11S2 was coming out, the answer is that the 11S2 was announced at CEDIA, months ago.
It has just recently come into production. So prospective 11S1 buyers had some FOUR MONTHS notice that the 11S2 was coming out. Is that enough notice for you?