I read somewhere I think on the old FHD mod thread that most of the internal USB devices (Bluetooth, Webcam) are 3.3V, yes. A look through the schematics confirmed this. It makes them pretty useless for anything but their intended purpose. The Bluetooth one for instance, while yes there are USB A adapters for them, can't be used for expansion of storage since those devices want the full 5V. Now the "ThinkMods" website did advertise manufacturing an actual 5V adapter but they also totally dropped the ball on delivering their expresscard product so anything they promise is realistically no more than a pipe dream. A little wireless KB/mouse receiver works, but I'm a TrackPoint user so that's not for me. An extra WLAN dongle that only needs 3.3V may be useful for some network ideas I have.
I believe there's a little space in the not-latch notch area, that the factory webcam could be crammed behind the LCD and a hole made in the bezel for the lens to see through, but I've decided it's not worth cutting up the machine further and the lack of the webcam is a novelty that should be enjoyed.

The ThinkPad webcams are pretty crap anyway so it's hardly a loss. With the 8:5 LCD filling the entire bezel this machine gets pretty close to the bezel-less aesthetic of the IBM era which is very nice.