What do we do with the “bottom half”?
This past weekend at Grand Prix: Charlotte close to 2700 people attended to battle some Gatecrash sealed deck. It set records in attendance for any Grand Prix anywhere. It also brought to light the disparity between “pro” or “grinder” and “bottom half casual”.
Wizards Announces Early ’12 Grand Prix; Announces Pro Tour Honolulu

Wizards has announced the first events of the 2012 Pro Tour season.
Wizards Adding More Grand Prix Events Next Season

According to a recent announcement by Wizards, they are planning on doubling the amount of large scale Grand Prix events for next year.
DCI Judge Wins a Florida Grand Prix Trial With New Mirrodin Besieged Event Deck
According to a report via Mananation’s twitter account, a judge in Florida ran with one of the brand new event decks and won a Grand Prix trial event.