For what it is worth, I have heard something as well, but it is a bit sketchy and I have no clue as to which network may be behind it ... allegedly a casting agency based in either Vic/NSW whom works with Masterchef, is now also involved with either Big Brother or Celebrity Big Brother, and if not that not a show
like Big Brother, which suggests a network is already looking at the casting element. What I
don't know is if this 'source' is the same one which The Courier Mail used in a report last month about a possible BB reboot. The fact everything is hush hush leads me to believe it might be CBB as that would be easier to keep quiet (no need for public auditions and thus no need to start promoting a reboot as soon as would be required for a regular BB). With this said though it is all a bit wishy washy at the moment...
N.b. The Courier Mail article mentioned above is quoted on the
front page, but you'll need to scroll past the plea for a live stream, if BB is to be rebooted

.