Thanks to Popular Photography we now know that Fujifilm will include a standard viewfinder in the box with the GFX 50S. This mean the adjustable viewfinder we have seen pictures of is an optional one and could hint at other optional viewfinders in the future. They also remind us that Hasselblad said zoom lenses would be very hard to make for mirrorless medium format, but Fujifilm managed to develop a zoom lens for launch, which is very impressive. This is probably the best hands-on video released yet and goes into details about how the camera feels. They say that it weighs a little more than a Hasselblad X1D and it is very well balanced with the 50mm equivalent lens so it could be used for street shooting!
Update: The camera is about 800g according to photographyblog, which is 75g more than the Hasselblad