Yeah, there will be minor changes in resolution, but you'll need a microscope (or at least strong magnifying glass) to see them. But the beauty of it is that 3:2 and 16:9 won't just be 4:3 images with the tops and bottoms lopped off - the actual sensor is WIDER for those aspect ratios so it's like shooting with a real 3:2 camera, which I personally prefer for most types of landscape orientation shooting. And, yeah, at 24mm and 16:9, the LX5 and LX7 were very very close to a 21mm width. I loved shooting with those cameras and the multi-aspect sensor was a big part of why. 3:2 as a default setting, 4:3 for street (where I'm often cropping down to a square anyway) and most portrait orientation shots, 16:9 for the rare occasion I want super wide. I'm not even remotely in the market for a camera like this, but I've liked the LX series sooooo much I'm actually tempted by it anyway, at least based on the rumors. Thiis will be the best low light zoom compact yet if it really has a GH4 sensor. And at f1.7 it'll be better even than the GR or Nikon A at f2.8. And will be about as good as anything else in good light (although it won't have the detail of that 1" Sony sensor).
Potentially a VERY VERY attractive package. IF (and this is a huge if and I don't expect it to happen), Panasonic suddenly wakes up the potential of auto-ISO and allows for a useful minimum shutter speed setting with auto-ISO, I'll eventually buy this because it would be as good a street camera as my Nikon A as well as being versatile as hell. But so far, only Samsung, Nikon, and Fuji (in only a few of their models) have figured out how to do auto-ISO right, and with todays' amazing sensor, to NOT offer those tools is almost a sin. I don't expect that at all in this camera, though - Pany hasn't done it in any of their higher end cameras - and then I'd have VERY limited use for this camera because I'd almost always have to carry another camera with me too. But if it has the auto-ISO functionality to allow me to carry JUST this for a lot of shooting, I'll find a way...
-Ray