Through the power of Nexis, WWB has unearthed the Oregonian Living section blurb/hat tip/whatever. Here it is:

"We don't get many white Christmases hereabouts, but there are plenty of signs that the holidays are upon us.

Though many of the sights are traditional, they're not unchanging. Will the big lighted martini glass in the hills above Southwest Broadway appear as it first did, a Playboy-era exhortation to par-tay! -- or will it be modified with a red diagonal slash to become an incandescent invitation to holiday moderation?

(An Internet blog, http://laurabush.info/, says both, actually: that the red slash lights up at 10 p.m. The sign's current owner didn't return a telephone call to his office, so we can neither confirm nor deny, only wonder.)"

Throughout the holiday season I've been (sort of) keeping tabs on the martini sign and the prohibitive slash hadn't made an appearance. I was heading home on night around 10 and the glass wasn't obscured. At 11:45 on another night, still no slash. Then, early this morning, I finally spotted it. Apparently, the owner doesn't plug it in until well after 12.

Another uber-important local mystery has been solved. Hooray!