Um, I posted a while back that my guess will be a complete merger of the two lines. With O having sell out capacity in most cabin categories, I think it won't be long before it's announced. I have no proof but having sailed on both lines in the current economy it makes business sense.

VOYAGER:
MC to FLL 11/07
MC/Dover 6/06
MARINER:
BCN / Ven 10/11
Alaska 2001|2006
Panama Canal 2003
NAV
Caribbean 11/06
Bermuda|New Eng/Canada 6/04
PG 5/05
OCEANIA
Nautica |Ist/Athens 6/07
Regatta|Baltics 6/08
Riviera 2013 Crossing -Istanbul to Miami