I do not recall hearing that a Molecular Bar is being added to any of the M-Class ships - I am not 100% certain though.
Celebrity Summit - November 26, 2016 - Southern Caribbean
Celebrity Infiniti - December 8, 2017 - Chili & Argentina (Around the Horn)!
Celebrity Xpedition - October 5, 2014 - Galapagos (Seals, Penguins and Boobies, Oh My)!
RCI Allure of the Seas - September 2, 2012 - Eastern Caribbean (Aft Boardwalk Balcony; 24 Restaurants in 7 Days)!
Celebrity Millennium - May 27, 2012 - Pacific Coastal Wine Cruise with Temecula, San Diego, and Vancouver Land Add On (Sky Suite GTY)
Celebrity Millennium - February 20, 2012 - Western Caribbean (Adult Spring Break: SoBe, Millie & The Penthouse)
Celebrity Silhouette - September 27, 2011 - Holy Land (Concierge Class)
Celebrity Equinox - October 31, 2010 - Mediterranean & Westbound Transatlantic with the Hobgoblins (First Suite)
Celebrity Equinox - December 4, 2009 - Southern Caribbean (Aqua Class "Hump" Stateroom)
RCI Jewel of the Seas - January 9, 2009 - Panama Canal Cruise with the Panamaniacs!
Celebrity Century - April 28, 2008 - Transatlantic: Miami to Amsterdam Honeymoon Cruise with the Centurions!
HAL Noordam - May 13, 2007 - Alaska Inside Passage
RCI Adventure of the Seas - November 26, 2006 - Eastern Caribbean
RCI Grandeur of the Seas - February 11, 2006 - Western Caribbean
RCI Enchantment of the Seas - January 8, 2005 - Western Caribbean