Having featured only a few women for actual accomplishments could be a real problem - except that it can probably be at least somewhat explained with a few observations: How many women did you see at Startup School this year? I'd guess the number was under 5%. What percentage of successful tech entrepreneurs you know are women? How many women are in YC? Based on these number, women may be over-represented for their digital accomplishments on Wired covers.
I do hope that changes, I'm always happy to see women entrepreneurs, and Startup School attendance is by no means a valid scientific study, but it does give us some indication as to why so few women are featured.