Since the first one finished just a week or two ago, I think there's only one point to this. (Or two: the second is to draw eyeballs to the Chess.com website.) Leela Chess Zero (Lc0) is improving rapidly, so there's a general curiosity to see how close it has come to perennial king of the hill Stockfish. One difference between this edition and its predecessor: the first one had the engines facing off at a 15'+5" increment; this one is a blitz battle at 5'+2".
Here's a not very bold prediction: for all the engines except for Lc0, it will be Stockfish first, Komodo and Houdini taking second and third (probably but not necessarily in that order). The only interesting question is if Lc0 has leapfrogged one, two, or three of the aforementioned programs.
More here.