Lightroom 4 BETA - Catalog Upgrade Message

I've just done some background reading, and the LR4 catalog upgrade message is only a concern with the BETA version.

Important notes from Adobe are (Primary Known Issues):

Lightroom 4 beta is not complete but please provide feedback on the available enhancements.

Lightroom 4 beta will not upgrade Lightroom 1.x, Lightroom 2.x or Lightroom 3.x catalogs.
The beta is intended to be used for testing and feedback purposes. Lightroom 1.x, 2.x, 3.x and 4 beta libraries will be able to be migrated to the finished version of Lightroom 4.

While data loss is not expected, this is an early ‘beta’ quality build and you should always work on duplicates of files that are securely backed up.

Lightroom 4 beta will not overwrite or interfere with a machine that currently has Lightroom 1, Lightroom 2 or Lightroom 3 installed.

Develop settings applied in Lightroom 4 beta are not guaranteed to transfer correctly to the final version of Lightroom 4.

The Lightroom 4 beta will expire after Lightroom 4.0 is available

In the link from Adobe : http://blogs.adobe.com/lightroomjournal/2012/01/lr4betanowavailable.html

On that page, there's a rather extensive list of improvements, ranging from better brushes, robust video support, photobook creation to name just a few.

I love it already just for the brush enhancements !