If you read German, you can google gardekorps and find a bit of information.

Here's a page from the German Wikipedia:
http://de.wikipedia.org/wiki/Gardekorps

So where can one get ahold of the version of this mod that Warhorse has been playing?

<t> I just played a scenario in RS that involved caves. While they were significantly more difficult to overrun than before, I don't think the new rules are worth abandoning the game over.<br/>
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I simply found that the tactics I had relied on weren't as effective as before, and I made ...

Weird. I just tried again, and it worked fine.

Man, new assault rules + caves = tough scenario.

I just had 'Climb Mount Yae Take' hang up on me in the second turn, same as always. [:@]

Any updates on this, or is it waiting for 1.03?

There was an EF (don't remember if it was EFII) demo included with one of the TalonSoft Battleground Series games. I don't remember which one though.