Sorry for causing so much grief with Quicktime, but I didn't really want to convert the videos from their original formats in case any minor details were lost in the process - besides, they've been compressed enough already!
P.S. I promised even more files, though sadly I've not been able to find much of worth just lately (but there are many more discs to search through, I must add). However, there were a few clips that may be of interest:
The original tech demo of Clockwork Knight (or "Knight" as it was still known back then), running on Silicon Graphics hardware and featured at the 1994 Winter Consumer Electronics Show. This footage comes directly from a lengthy US promotional video for the Saturn and clocks in at less than a second, but is - to my knowledge, at least - the only known media of the game in its preliminary stages. So far, the other two CS-developed titles previewed at the same event - "Soccer" (Victory Goal) and "Dragon" (Panzer Dragoon) can only be found as screenshots, though elements from the former's SGI showcase were included as part of the final version's intro sequence. Which parts were used is anyone's guess, though...
Taken from Sega Flash Vol. 4, here is the original tech demo of Last Bronx in its Model 2 arcade guise, featuring the AM departments' typical exercise of showing characters over a wireframe background. As somebody who isn't totally familiar with the coin-op (actually, I was first introduced to Last Bronx through its Saturn and PC conversions), I can't really tell for sure if there's anything significantly different from the final version, though it's good to see that Sega could afford to use direct-feed footage on their own official demo discs - just check out the video and you'll see what I mean!