A source of mine shared what appears to me to be a real roadmap for Gemini.
It kicks off with "Gemini wave 1.0," which includes the "Blue" Metro-Style/Windows Store complements to the core set of Office products -- namely, Word, Excel, PowerPoint and OneNote. From what I've heard previously, these four apps will be more touch-centric and will work on Windows 8 and Windows RT. They will supplement, not replace, the desktop/Win32 versions of these apps that already exist. These apps will be made available to customers by October 2013, according to the purported roadmap.
Also on the roadmap for fall 2014 is what's listed as iOS/Android support for Office. One would assume this is the expected and widely rumored Office for iPad release. It could, however, be Office for iPhone and Android phone, given that it's not listed on the roadmap as being tablet-specific.
In sum, this is what the alleged roadmap indicates:
Gemini Wave 1.0 (October 2013): Windows Blue app updates
Gemini Wave 1.5 (April 2014): Office for Mac; Office RT refresh; Perceptive Pixel support; Windows Phone support refresh
Gemini Wave 2.0 (October 2014): Outlook RT; Office for iOS/Android
I do not know how old this purported roadmap is, but my contact indicated it was likely current as of the start of 2013. I asked Microsoft Office officials for comment on the alleged roadmap, but they declined to do so.
"We don’t have any information to share about the next set of updates to Office," a spokesperson said.
One last thing to keep in mind: Even when Microsoft commits to ship targets in roadmaps, things can and often do change. Demand (or lack thereof) can result in planned products releasing earlier or later than the planners anticipate.