URGENT! Delayed Graduation for FT due to Study Abroad, what do I do?

I am an incoming FT at a BB (IB ignore the title). Long story short, I will be doing a full year study abroad next year, which is also my last year of school. I just learned today that we don't get grades back from that until September. 

This leads to two obvious problems. 1. The FT offer is obviously contingent on graduating, but I technically won't be able to official confirm my graduation until I get the grades back in September / October, which is several months after FT starts.

2. I will have a whole year missing from my GPA for On-cycle recruiting.

I don't think the second is that big of a problem, but I am seriously concerned about the first. Any thoughts or monkeys that went through something similar? Should I cancel my study abroad?