This one finally gets around to adding some more AI Eye variants to round finish response to the Eye winning a community poll back before the beta of Ancient Shadows. There are several new devious toys in there, providing varying degrees of "I do not want to make this angry, ever". Also, the AI homeworlds now get versions of eyes with a few important special characteristics (though their main functions are no more powerful than normal eyes).
The Deepstrike-response mechanic has also been overhauled, and should now be harder to just brush off for a few cases where it wasn't particularly threatening.
Rounding out the release are a few bugfixes and balance changes, and a couple new surprises for avid knowledge-raiders.
This is a standard update that you can download through the in-game updater itself, if you already have 4.000 or later. When you launch the game, you'll see the notice of the update having been found if you're connected to the Internet at the time. If you don't have 4.000 or later, you can download that here.