For anyone who is wondering where to download upgrades, here they are.
Version 4.0.2 is actually already available on most newer models from most US carriers now. If you have a newer BlackBerry model, you can easily protect yourself today simply by upgrading to the latest. I'd expect that remaining models and remaining carriers will quickly get upgrades.
Please remember you have time to test before deploying. Version 4.0.2 is still being updated with fixes as time passes. BlackBerryOS Upgrade Downloads This article tells you where to download the BlackBerryOS upgrade for your particular BlackBerry handheld. Also where to download the latest BlackBerry Desktop as well. Includes Version 4.0!