From what I can see, Ed Sanders didn't mention anything new about this case except for these things:
Hatami now has no memory of Charlie being at Cielo Drive in March of 1969 (which doesn't make any difference really).
Sanders claims that Sharon "overheard" something about Sirhan Sirhan (yes he has the same first & last name) and an "English Cult" contracted Charlie to kill her.
And then he says "what she overheard can't be mentioned".
We haven't solved these murders. We're back right where we started.
And, at the end of Sanders' book, it seemed he was sad about Sharon's murder, but WHY did he go on and on about her being in a cult???
That's the problem with these new books. They propose lots but prove nothing....