http://support.microsoft.com/kb/2854009
Microsoft has publicly announced the availably of CU2 for ConfigMgr 2012 Sp1.
I will let you read the information for yourself but it fixes several issues for us.
CU1: Alternate port download for Windows update
CU2: Imaging over Alternate ports and BGB issue when using Custom Websites.
Like Cu1 you will need to have an update to the client pushed as well as an update to the Task Sequence for the client.
One thing I will need to test with this release is the need to repush the Boot.wim. This would be necessary for the companies running over alternate ports. It is also a good practice to create new boot media for your machines.
I hope to have this fully tested soon but none of what I have suggested is destructive to your enviroment.
