I seem to recall very thin wings being touted as lower drag, but are unable to store fuel. Are the trusses there to support thinner wings?

Edit: the answer seems to be yes, they are thinner wings, called the Transonic Truss-Braced Wing (TTBW). However why is it transonic? higher speed would negate the fuel savings. Also this looks to be experimental and not for the next generation.

https://investors.boeing.com/investors/news/press-release-de...