You ordered a Motobecane, which I would normally say you made a good choice, but if you want to change out to a Carbon frame and also change out the wheels, I would suggest canceling your order and building your new bike yourself. You will be happier in the long run as you will be able to select each part and learn how to assemble and maintain your bike.
I hear ya, but the Moto has a great selection of parts that I'd want anyway - Bluto fork, XT, etc. The frame upgrade is a long-term option if I'm really hooked, and the moto gets me up and running quickly. Upgrades can then happen from there, as I feel inclined. My plan for the 057 was going to be assembled off of spare parts I have on hand already, but a fattie introduces a number of parts I don't have on hand.
The carbon wheels make tubeless a whole bunch more feasible (and tubeless on a MTB isn't optional for me) and save a huge amount of weight, and I'll just sell the originals to offset the price.
As for learning how to assemble and maintain, I've been building bikes and wheels for a loooong time now, we even turned my garage into a bike shop. I got that covered!