It might be that the new camera uses PTP mode by default, in which case some of the camera packages (digikam etc) might see it, but probably not if it's a new model. If it's in PTP mode then it won't mount as a USB filesystem.
If it is using PTP mode then there's probably an option on the camera menus to turn it off & on.
I had your problem with my Nikon coolpix, and this was the solution for me.
Good luck, Marttyn.
I have been touched by his noodly appendage.