I didn't take the time to read all of the replies.
You should have. Someone else also present at the seminar provided the exact same information upthread, and I XP'ed them for that. Mind you, I quoted the tweet source, and if the tweet is incorrect, then I should mind my own sources better in the future.
We know two things for sure, though.
1. Rituals were originally in Mordenkainen's Emporium. They were removed.
2. Rituals are going to get attention in the future, though what exactly is happening to them remains to be seen.
I see the removal of content as not well balanced by a vague promise of attending to problems which were pointed out to the designers as early as in 2008.
The other thing in the OP I stand by is this. 2011 saw the removal of a lot of D&D product, a shockingly small remaining product catalogue, and a man at the helm of D&D design who produced now ostensible design ten months before he was made lead manager of D&D. It's highly unfair to castigate Mearls by himself. I'm frankly appalled that nearly all the product that gets released this year is done by freelancers (Gloomwrought, Heroes of Shadow, Threats of Nentir Vale, ...), and hardly ANY in house effort goes into the actual writing of product anymore. What are Rich Baker, James Wyatt, and Bruce Cordell writing these days for 4E? Why is everything we 4E fans should care for outsourced?
This strongly reminds me of the times when 3.5 was on its way out, with the second (and frankly, mostly subpar) batch of 'Complete' splats written by freelancers, while WotC designers were busily putting their efforts to The Next Big Thing.
I understand that this situation benefits freelancers like yourself, and I've only heard got things about Threats of the Nentir Vale. But I've personally abstained from buying WotC product until I see in house design effort more clearly again, and frankly, some faith in and enthusiasm for one's own product coming from WotC.