Security Technical Overview could mean that BlackBerry PlayBook OS 2.1 and Bridge 2.1 are coming soon
Cover of the Security Technical Overview
If you have had trouble sleeping, or actually do find the subject of security to be fascinating, the entire booklet is available as a .PDF file by clicking on the sourcelink. For those who can't remember the last time that the PlayBook was updated, it was toward the tail end of February when PlayBook 2.0 was made available.
source: BlackBerrySecurityTechnicalOverview via BerryReview
One of the pages belonging to the Security Technical Overview, dealing with the BlackBerry Bridge app 2.1