Any printed material shipped with the units would be out-of-date by the time you received it. The software that ships with the Pandora will be minimal and will likely see several updates before too long.
Agreed totally.
Disagreed totally. Mostly.
A manual should cover more than just the software. It also includes the hardware, such as how to install the battery, what each LED means, the different ways the power switch works, the various ways to charge it, how to use the USB OTG port, restrictions on the USB port... probably a bunch of other stuff. A basic trouble shooting guide never hurt either, for when you're not near a network connection.
Also, I can't imagine that a lot of the software really would change, at least not the kinds of things that would be included in a manual. I would hope that basic stuff would remain consistent, such as how to recognize the bios start screen to confirm it is, in fact, booting; how to start an application from the menu; assorted configuration changes, not the least of which is keyboard mappings. No doubt several other things as well. All this stuff is basic to the OS and shouldn't change a whole lot over time.
I'm sure a lot of these seem like no brainers, but we're not the only ones that will be using it. There's no doubt going to be a large number of people who have been watching with only mild interest that'll pick it up who haven't been reading the forum, and don't know about a lot of the features.
So my vote, simple manually, maybe a dozen pages tops, in the native language of whatever country it's being shipped from, including hardware setup, basic OS features, and short troubleshooting guide.