I believe Patti is leaving July second, though she has said she will probably extend.
Norbery and Greg, are leaving sometime in July, along with Jonathan Pryce.
Sutton and LaChanze will probably stay in their shows through the summer,a nd don't have a leaving date yet.
I am a firm believer in serendipity- all the random pieces coming together in one wonderful moment, when suddenly you see what their purpose was all along.