And a more serious theory to account for one aspect of the new
camera's appearance, the reappearance of the left hand side of a
conventional camera "box"...
E-1 had a shutter comparable to a Nikon D100 (1/180 sec sync,
1/4000 sec top speed). That was unusual for a "pro" camera: in the
pro category Nikon and Canon were both at 1/250 sec sync and 1/8000
sec top speed. On film cameras, this was the spec for both the top
models (Nikon F5, Canon EOS 1v) and the next models down (Nikon
F100, Canon EOS 3). And now Nikon's at that level on both D2X and
D200, so it's becoming the "baseline" for even intermediate
cameras, let alone pro.
How can Oly get to that level? E-300/330 is a high quantity camera,
so Oly can have a custom shutter (and the sideways moving mirror)
built for it, especially considering that the E-3XX shutter isn't
exactly a high performer.
E-1 had a pretty much stock shutter, but it wasn't a large, high
performance model. That helped them get away with E-1 styling, no
"left side" of a conventional camera. But if they want something
that really moves for an E-3, that has specs comparable to a Nikon
or Canon, they've got two choices. They can either catch up to
Nikon and Canon, and do it in a form factor that lets them keep the
E-1 "no left side" style, or they can adopt a more conventional
shutter design (either have someone like Sanyo "clone" a D200
shutter, or buy something from Nikon, Canon, or Pentax). I'm
betting the budget at Oly isn't that large for a small quantity
camera, even if it is a "flagship", so they're going to float a
more "conventional" appearance at us to make it easier to actually
build a high performance camera.