It is news to me, as of yesterday, that for accounts with over 5 million dollars in capital the margin given to an account is 10-1. If that is the case, it changes the entire hybrid prop model.
Ok, I only heard it in conversation yesterday. However, I just spoke to my partner and he confirmed 10-1. He is not certain where to find the documentation.
Look at the following thread. There are a lot of info regarding the new margin rule. http://www.elitetrader.com/vb/showthread.php?s=&threadid=78820