What's up with the g100 specs?

I think the camera is an interesting hybrid with a stronger play in a travel/street than is advertised over it's vlogging.

I see it as a next gen to the GM1/GM5/GX850 line, albeit larger, in exchange for features people most complained about not having on those (except IBIS). Like those, it prioritizes size over IBIS. Camera bodies in this size class are not usually going to be used with long focal lengths. If I want to use any tele longer than those 45-150's I would pair with the G85 or G9. Many of the short tele's have OIS.

I find IBIS less helpful than hoped in low light because if anything is moving, unless you can incorporate motion blur artistically, then IBIS doesn't help.  It does help get those dark cathedral kind of shots but out on the street it is more mixed in usefulness.

Over the GM1/GM5/GX850 line it adds a fully articulating screen, latest 20MP sensor, an EVF (and nice one), hybrid 5-axis, and other features. It is 90g heavier than GX850 and nearly 150g heavier, almost double, the venerable GM1.  In form factor, it's nearly the same width and length as the GX850, except with a big EVF stuck on top.  It's much thicker due to extra grip surface and EVF.

At close to the same size, you can get ~75g heavier GX85/GX9 and get IBIS, but then you only get a tilt screen. Head to head, the GX9 does seem like a more desirable platform that you would try to make work in situations where an articulating screen would be better. In that matchup, to take the G100 would require someone who really wants the fully articulating screen and/or video/vlogging features and/or for whom 75g is a welcome amount of weight to cut from a GX9.

Depending on the person, it may be more ergonomic than the GX line. I'm left eye dominant so my nose continuously changes the auto focus area on the GX's (I love the GX's anyway and use them the most). The G100 is a hump camera with the EVF in the middle and also the typical hump camera bigger better grip.

I think it does fill in some gaps, whether that is enough remains to be seen.  The challenge is that there is no perfect camera, they have to make and bundle up tradeoffs in some thematic way.

There are NO used copies, no compelling grey markets, and precious few reviews (11 on amazon, 2 on B&H).  I had another thread about that and folks felt it was probably because it is not selling well.  I hope Panasonic does well with it and everything else, I might get one to try out but only if it goes to GX85 pricing (between sales, grey, and used).