Chas-
"I believe they will probably make the announcement of event 1290 at the end of the quarter, after they receive their quarterly event data."
Interesting logic, as always. Then the obvious question is: on March 30-1-2016, when they announced 60% onset, was its timing coincidental with quarterly data & actual #967 (and events in queue) reaching right before? Because if # 1290 occurs in mid-January like you say, are they going to wait 2.5 months to announce the onset?
I'm not familiar with quarterly data - I can't imagine them having to wait that long for that. But what JL said earlier also makes sense, that they may want to take their time, accrue more events.