Can anyone locate specs on this wifi module?
Your assumptions are close :D. It doesn't turn on the wifi unless you go through the menu to enable wifi and add the ap settings and all.

Based on the FCC ID AZDK30306 (AZD is the Grantee Code, K30306 is the model), searching on The FCC ID page, it's 3.3v (not 5v tolerant), no internal regulator. Peak 0.6A. Based on USB. Full 802.11b/g support.

Pins from the left to right (facing the connector, on the top side):


Gnd
D+
D-
VCC
Gnd


There are some internal pictures, of the thing with the rf shield off, but they are low res, so can't read the labeling on the three main ICs for more info, but the sheet says it's a arm based . Unless the USB vid/pid pair is a common one, finding drivers will be, well, ice cube in hell. I doubt there is standard Windows drivers available for it, being a wifi module only meant for two specific types of printers.

Looks like there was probably a mistake in them providing the datasheet, but even then, based on the pictures of the module online, it was obvious that the two outside pins were ground, the VCC was the second pin from the right was vcc (big trace on top and bottom [under the sticker]). Leaving the last two unknown, but considering how often manufacturers have moved to modular design with usb as the connection of choice, I would have guessed usb anyway. That's being used for everything from internal webcams, touchpads, keyboards, character lcds, etc. USB is just really convenient.