There is an interesting article
on cnet with Akira Watanabe.
Olympus has declared 12 megapixels enough and they will work on dynamic range, color reproduction, and better ISO.
Also interesting is that he claims contrast based AF will exceed phase detection in the future. It sounds like he's considering the whole package rather then just speed, but it looks like Olympus still has some exciting research they haven't shown to people yet.