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I don't know about his favorite, but in interviews he mentions he went back to Basic D&D, which is not OD&D.
Where Is D&D Headed Next? An Update with Mike Mearls ... And the Public Playtest Begins | GeekDad | Wired.com
But regardless of what 4e fans think, 5e (so far) bears little to no resemblance to old school D&D or AD&D. At least IMHO and most other old school fans I've read express an opinion.
Depends on the particular fan you ask though I think.
I would say I'm a fan of oldschool, but I've also been a fan of D&D in all of its forms.
There are some out there though who would say it doesn't bear any resemblance unless it literally was just a reprint of 1e.