(It looks as if Microsoft has been sharing its CRM roadmap with its Dynamics partners and allowing them to go public with it. When I asked officials for comment on these latest codenames and roadmaps, I was told Microsoft hasn't announced any of these officially. Official or not, it seems to me like this information is coming from Microsoft.)
Gemini (due in Q2 calendar year 2013): This is the updated MarketingPilot technology, which may be officially branded as "Microsoft Dynamics Marketing." This addition is expected to include a revised UI with the "flat" Office 2013 look and feel; integratin with Dynamics CRM; new social media capabilities; updated digital-asset management and more. Microsoft officials said last year they'd be sharing publicly plans for MarketingPilot integration at Convergence 2013.
Orion (due in Q3 calendar year 2013): This update is supposedly a major one and may be released as "Dynamics CRM 2013." It will feature the flat "Office 2013" look and feel for both Online and Offline; changes to Classic Forms: Direct Exchange integration (bypassing Outlook) based on the Exchange "Agave" framework; and the on-premises version of Dynamics CRM for iPad.