Just did the upgrade to 4.01, very smooth, but I did get one error. I looked around and didn't find it here, or in the bug list, but I could be blind, or maybe it only happened to me. After the upgrade and after a reboot of the server (to fix something else) I got the following error:
"INIT: Id "1" respawning to fast: disabled for 5 minutes....(I can't remember the exact text)"
The problem was at line 1011 of the console script. I went and had a look and there was an unwanted "(" preceding the /dev/ttsy0 line. Removed the "(" and everything worked fine.
Now it's documented.
Noah