The Waiting s the worst
Bookeen normally takes at least a week, normally more to process an order and dispatch it.
So you might have a few days wait. You can however take comfort that the people who ordered from NAEB have been waiting even longer.
What you can do (and what I did) was get all the books you want to read in the Gen3 ready, so that you can transfer them onto the device as soon as it arrives.
The only drawback

is that you can't read while charging