Well, I bought an FZ-55 (MK 1). I went ahead and upgraded to Windows 11 which, as far as I can see, runs perfectly.
The 14" screen is nicer dimensions that the CF-31 being wider screen ratio of 16:9 instead of old 4:3, and resolution of 1366 x 768 for non-touch screen, and 1920 x 1080 for touch screen model.
Webcam is 1080p, with infrared, so is usable for Windows Hello. Built in privacy shutter on webcam is a nice touch.
At 92 db sound may be a
little louder than CF-31, but still tinny like most laptops. It may be more that the speakers are on the top of the deck, making them seem louder. If they are indeed louder, you would probably need a meter to prove it.
Keyboard is as nice as the Backlit emissive keyboard on CF-31, with the added ability to change the color of the backlight. Keys are slightly different shape, kind of feather shaped (?)
It only has 2 USB type A ports, and a USB type C. But more can be added with xPAKs. The doors over these ports do not leave room for door to be closed when a nano receiver for mouse is inserted like you can do with CF-31.
Mine did not come with an optical drive, so I ordered a DVD xPAK, and it came with CyberLink PowerDVD and Power2Go software.
In the new FZ-40 thread, some mentioned fears that Linux could not be installed on the newest ToughBook 40 because of UEFI and Secure Boot. I don't truly know about that, but I can say that I was able to boot to a freshly downloaded Fedora Workstation 36 installer after going into setup and clearing the Secure Boot keys. I did not try to install Fedora, but I imagine that if the installer boots, then it should be installable. That was how I installed Kubuntu on my CF-31. Since I have it on that computer, I don't need it on this one too.
Then I removed the Fedora installer and rebooted. Trouble!! It would not boot! Yikes!! I went back into setup and in the Secure Boot setup clicked for it to restore the default security keys (can't remember exact wording). Still Windows would not boot. A page came up saying that I needed recovery keys. It gave me a place to type in the recovery key, and suggested going to
aka.ms.myrecoverykey to recover the key. That required a Microsoft login, and gave the the recovery keys for all 3 of my laptops. That key had more to do with BitLocker than Secure Boot, although Secure Boot stores that key. Now I'm back in business, with Windows 11 booting.
So if you want to experiment with Linux distros, first back up any important data (as always), then find your BitLocker recovery key (if you are using BitLocker), then find a Linux distro that supports UEFI and Secure Boot (Ubuntu, Debian, OpenSUSE, Fedora, and RedHat do, maybe others), then go into setup with F2 key, as on all other ToughBooks, and clear the Secure Boot keys. Then you should be able to install Linux even with UEFI and Secure Boot enabled.