After reviewing the maingame clip of "The Pyramid" posted by Buzzerblog & GSN, here's what I know:
-For at least the maingame, the sound effects of the clock counting down are the same as the ones from The Winner's Circle in the '09 "The $1,000,000 Pyramid" pilots.
-The clock's design matches the scoreboard.
-When time runs out, the timer rises up & the desk in play turns from yellow to blue.
-The $500 bonus for every 7-out-of-7 carries over from "The $100,000 Pyramid" pilot that was hosted by Donny Osmond.