1. The link to install on page 1 is a signed version. I see no difference between it and the one that I actually downloaded that is leaked.
2. If your rooted then you need to go to page 6 and download Jrummy's version which will keep you from losing root.
3. If you're not comfortable with any of this, then simply wait for the OTA.
I think that out of all the updates I've seen come out in the past year and a half, I've never seen so much confusion. Part of that is our fault, and when I say our I mean everybody in the forum, not just CK and myself. I think we tend to read too much into every little comment. To the best of my knowledge other then the size of the app it doesn't appear to be anything different then what's going out OTA. I wouldn't call what went out last week a patch, it was indeed 2.2 as is this one.
Supposedly what was added on was some security enhancements for business users. If that's so I wouldn't know because I never looked for it in the original version.