In general, Linux is Linux, and Debian is Debian, so what you learn on the machine you have should transfer directly to the R-Pi without any "re-education" at all. I use Linux daily on both Intel servers and IBM zSeries mainframes, and there's really no difference from a user's standpoint.
If libgphoto2 is available for arm, then you should be able to get it to work on the R-Pi. It it's available as source, you should be able to get it and compile it to work on the R-Pi. That being said, I have no Pi to test this theory on as yet; I'm still waiting, just like you.
Your real trick may be the "wireless" portion, as many wireless dongles require non-opensource code that may not be available for the R-Pi. If you haven't bought a wireless interface as yet, be sure what you get is going to work with the R-Pi.
"In theory, theory and practice are the same, but in practice, theory and practice are different."