Google acquires Postini

Google has acquired Postini to better improve Google Apps.

A blurb from Postini's website:
With Postini Solutions, you can secure all of your electronic communications - email, instant messaging and the web – and manage your company's communication policies from one central location. Postini Solutions can also make it easy to meet your archiving and encryption needs.

Things I would like to see come out of this:
* The ability to encrypt Gmail messages and Google Docs without having to use greasemonkey
* A Google API to encrypt files and transfers in your own application or site
* (Ad?) subsidized access to Postini services

The question on the tip of my tongue is, is Postini going to remain a separate entity though owned by Google, or are its services going to be completely integrated into Google's services?