I think that Rachel will be in Knights of X, which sounds like Tini Howard's sequel to Excalibur. She's dropped way too many hints about this for it to not pay off.
I'll do you one better - Rachel/Elizabeth/Saturnyne in Knights of X.
I seem to remember Ray and Opal having a lot of chemistry in the old Excalibur. And of course Howard has been pushing the Betsy/Opal and the Betsy/Ray angles hard in her Excalibur. It's time for it all to pay off.