What Mergard will work on at Apple is unknown, but it's speculated that it may be an ARM-based project.
The blog says Megard was among the "most prominent" new recruits in that team. Mergard's career also included a 16-year stint at AMD, where he served Vice President and Chief Engineer and was "known for playing a leading role in the development" of AMD's low-power E-series APUs, which are part of the Brazos platform.Source: The Tech Report
This hire may be more significant than some realize. Patrick Moorhead, a former AMD VP and Corporate Fellow who now heads his own analyst firm, told the Journal that Mergard offers "deep expertise" in system-on-a-chip devices. The way Moorhead sees it, Mergard would be "very capable of pulling together internal and external resources to do a PC processor for Apple."