Take a look in the warranty section (or do a search) and use that as a checklist for things to look out for. If any are present, I'd suggest that you get them to do the work before you collect it, otherwise the loss of the sound you will no doubt fall in love with will be upsetting!!
As for the drive, if you've had an S2000 then the rear drive will be nothing new, just expect a fair bit more grip (especially in the wet! ) and of course 3 billion times more torque.
Other than the warranty points, there's nothing to really worry about, just enjoy it!