This link at USA Wrestling states that NBC will offer lots of coverage of the world championship:
NBCSN will air 6.5 hours of tape-delayed coverage in the afternoons and evenings — Aug. 23 (3:30-5 p.m. ET), Aug. 24(4-5 p.m. ET), Aug. 25 (7-9 p.m. ET) and Aug. 27 (3-5 p.m. ET) — while the newly launched Olympic Channel: Home of Team USA will televise live medal-round action from 1-3:30 p.m. ET each day of the tournament.
Additionally, Trackwrestling will offer full access for $9.99. I wasn't aware of the NBC broadcast plans so I thought I'd bring it to the board's attention.