8-K's don't mean much. They're material events that are reported in between filing periods. They had a material even, they reported it and that's fine.
As a matter of fact, even if the 10-K isn't complete, the audited financials could be put out anyway. There's no extra cost involved. If I were them, I would've done an 8-K and included audited financials and that would've had the most impact.
To answer your question, you can't determine book value until you see those audited statements. glty.
The most valuable commodity I know of is information