Nobody has any better specs because they haven't been released yet. However, I have seen the concept in person and I can tell you that there is room back there for luggage for two people and a cooler. In addition, the back seats will fold down to make more room. From the "Tape Car" wind tunnel model, we can see that it appears that the belt line has been raised (no surprise there) and that should result in greater trunk capacity. I think you'll be fine.