There is. More than one, in fact;
The Zbrush 4 Beta Testers forum
http://www.zbrushcentral.com/forumdisplay.php?f=112
Here you will find a treasure trove of new info, workflows and video tuts. Showing 100% ZB4 techniques;
HOSES, SHOELACES;
http://www.zbrushcentral.com/showthread.php?p=717642#post717642
BRAIDS;
http://www.zbrushcentral.com/showthread.php?p=714442#post714442
KNOTS, ROPES, GEARS;
http://www.zbrushcentral.com/showthread.php?t=91840
CHAINS, ROPES, including brushes to download;
http://www.zbrushcentral.com/showthread.php?t=91827
I highly recommend reading ALL the Beta tester threads, as they are the source for all of the official tutorials and documentation.