Why? Pretty much all of the news conferences for the last two years have been pretty benign, providing some light direction. They haven't given these big business updates to try and explain supremely bad news.
Why would they start now? We didn't get a business call after the clinical hold, or asking for a share increase, or with either of the two offerings this year.
This announcement signals nothing bad. And if you're really going to try and read the tea leaves on it, then explain why they would do it right in the middle of the trading day?