I was interested in the constant(s).
Prior to the ELO reset, it seemed like the constant was actually 1 based on big wins or big losses. I was able to semi-consistently figure out where I was going to be within about .5 after a win/loss. This was based on looking at the ELOs of the people in the set, and for anybody not listed I'd assumed an ELO of 1350 (1800 vs 1300 or 1400 has a swing of about .05).
However, when I beat only one person I expected to gain something like .4 or .45 since I had a higher rating, not 4+ points.
So, not the most critical thing in the world to know, but if it's possible to easily figure out I'd be interested in knowing.