This was the primary team, per WotC, in January 2012:
Mike Mearls Team Lead
Greg Bilsland Team Producer
Monte Cook Design Team Lead
Bruce Cordell Designer
Robert J. Schwalb Designer
Jeremy Crawford Development Team Lead
Tom LaPille Developer
Rodney Thompson Developer
Miranda Horner Editor
Monte Cook has left. Presumably one of Mearls, Cordell, or Schwab has taken over his duties. Rodney Thompson has been pretty active at panels, columns and such, so it's possible he was moved onto the design team.
For comparison, this was the 4e design team:
Orcus I, June through September 2005: James Wyatt, Andy Collins, and Rob Heinsoo
First Development Team, October 2005 through February 2006: Robert Gutschera (lead), Mike Donais, Rich Baker,Mike Mearls, and Rob Heinsoo
Orcus II, February to March 2006: Rob Heinsoo (lead), Bruce Cordell, James Wyatt
One Development Week, Mid-April 2006: Robert Gutschera, Mike Donais, Rich Baker, Mike Mearls, and Rob Heinsoo
Flywheel Team, May 2006 to September 2006: Rob Heinsoo (lead), Andy Collins, Mike Mearls, David Noonan, and Jesse Decker
Scramjet Team, same timing as Flywheel: Rich Baker (lead), James Wyatt, Matt Sernett, Ed Stark, Michele Carter, Stacy Longstreet, and Chris Perkins
Flywheel was the final crunch development team, Scramjet was the final fluff development team. Scramjet in 5e terms would be James Wyatt, Jon Schindehette, and Chris Perkins at the least, in addition to any subordinates of Wyatt and Schindehette that are as yet unnamed.
Personally, it doesn't look to me like 5e is working on a skeleton crew, so TCO is either uninformed or making things up.