I haven't seen any discussion around here regarding this new program that Slysoft is developing. It appears to be an equivalent program to CloneDVD 2, but for blu ray video instead of dvds.
They've been talking about making a program like this for several years, and I haven't been over to their forums for a while, so I was surprised to see a thread that began the 28th of May discussing this beta program. Here is the link: http://forum.slysoft.com/showthread.php?t=53392
It will be quite close in function to BD Rebuilder, though it offers some new features, like opening ISO files directly, and more preview options. There is nothing in it to tempt me personally, at least not so far. BD Rebuilder is really quite good, and Slysoft cannot match its price.
What they are not talking about much so far is Cinavia removal. But if they come up with a scheme to attack Cinavia, I believe it will come through this program. But its still beta. May be an interesting program to watch for in the future.