This patch has been released to fix a few of the most obvious issues that popped up in the beta3 release. An updated engine version with fixes to the networking and sound, a couple of fixed maps, some other various odds and ends such as documentation; the readme file included should have more info for those interested.
I do realize that this is ancient now, but I have a question. Before Predator started doing his server, I tried TF with a friend. He lagged enough that he could never move. Was that kind of issue fixed or was it slightly improved?