" So we have the regular overhang and foam sealing on top that gives rain protection, but the bottom, the part you might set in a puddle, is tightly sealed. It makes sense unless we missed a leaking point on the bottom. "
At least my impression is that the lower 2/3rds has something new and better, the top 1/3 has the same weather sealing as previous "5" cameras. Overall, I consider this very good. But, yes, I can see how carrying the camera upside down in the rain might be an issue. You'd be counting on the foam sealing.