Cisco has given us the exact date of the 2.x to 3.x CCIE Security Lab update:

Refreshed CCIE Security Lab Exam Available April 20, 2009

An updated version of the popular CCIE Security Lab Exam will be made available April 20, 2009. As previously announced, Cisco has refreshed the exam with the latest Cisco equipment and software to mirror the job knowledge and skills needed by security professionals. In addition, a continued emphasis has been placed on troubleshooting to recognize the operating challenges faced by IT departments. Candidates scheduling their lab exams April 20, 2009 or later should prepare using the CCIE Lab Exam v3.0 Overview, the CCIE Security Lab Exam Blueprint and the CCIE Security Lab Exam v3.0 Equipment and Software Overview.  Candidates testing prior to mid- April 20, 2009 should continue using the v2.0 blueprints and the v2.0 CCIE Security Lab Equipment and Software Overview.