This is how I imagine Panasonic's consumer department has been conversing:
Enlightened Panny consumer bod: This GH4 is great - but it's a video-centric camera, and it's only real weakness is low-light situations. Let's fix that for the GH5.
Panny corporation: Sounds good, How do we do that?
Enlightened Panny: Well, we lower the pixel count and...
Cautious Panny consumer bod: Woah, hold on there! Yes, the GH series is video-centric, but this is still a consumer unit. We absolutely need to appeal to stills buyers as well, and they want to see more not less megapixels.
Corporation: Hmmm... tough one! Well I can't give you both what you want. Or can I? How about we split the range - a hybrid camera for the masses, a stills oriented version, and a super video oriented version.
Panny Professional division bod: Woah, hold on there! I couldn't help overhearing. Just how super video orientated are we talking here? I don't know if any of you read our memos at all? You know - about the EVA - the big super charged video camera we're going to be launching right after your launch window! You sure you're not gonna be cannibalising our sales?
Corporation: Hmmm... I see where you're coming from. Okay - let's stagger the whole thing. We do the GH5 as normal, and the stills version; then we give the EVA a bit of room to breathe; and then we do the video version after that. Might have to delay a bit so as not to piss off the GH5 purchasers too much. Agreed?
All: Agreed!