Congrats. I would surely do a very thorough Pre Delivery Inspection (PDI).
Look over everything for operation, defects, etc. This is your first chance to get things right before signing/delivery. Ensure they show you how to work everything. Check every system, and don't be afraid to ask questions.
There are some good checklists out there you can study/bring with you. (there have been threads about it right here)
Good luck! Post some pics when you get her.
Pete (Jolly Mon)
2014 Jayco Whitehawk 24 RBS
2004 Nissan Titan LE, 4x4