Given they've released a few specific
lenses for their current system and are
about to release three more costly ED zooms,
it seems likely that they are sticking with the
4/3rds system and that sensor size is not
going to go up, if at all since the lenses they are
producing apparently will not support a larger image
circle than can contain the current sensor dimensions.
Which then begs the question, has Kodak come up with
something new for them, something that has less noise
and greater sensitivity than current small sensors?
Given the hype that the marketers of Canon, etc, have attached
to the idea of a "no noise" under high ISO sensors, it seems
unlikely that someone attempting to compete with Canon's marketing
juggernaut would put out another camera with a sensor that has
considerably more noise than the Canon offerings.  But, does Olympus
see greater value in having lenses that offer greater effective
focal lengths at higher speeds than their competition?
Given the smaller sensors sizes they have (Olympus) it is likely they
can produce (for e.g.) a 400mm (35mm film equivalent) at f2 much
less expensively than can Canon who now have to produce lenses to
support full-frame size,  given that is what their flag-bearing sensor
size is.  Unless of course Canon decides to stratify it's lens
offerings by camera, which would mean different lenses for the Rebel
and 20D versus the flagship full-frame camera.
Whatever Olympus is up to, it had better work for them.  Otherwise
they could find themselves pushed out of the DSLR market altogether.
-Rich