Wasgo: I'm certain based on the clues that it's Halo. The countdown is positioned to be replaced with the letters H, A, L and O. The words unexcelled can easily refer to something from Microsoft other than Excel and the graphic would work perfectly for Halo as well. In addition, it meets the criteria for a game that was previously mentioned.
While Halo might not be the most exciting game, if Microsoft is now supporting GOG.com it would be a huge coup, as it would be an amazing signal to other publishers than the GOG.com method should be supported.
Also, Microsoft is a top 3 video game publisher by revenue: [url=]http://kotaku.com/5030320/here-are-the-top-20-publishers-in-the-business-ranked-according-to-cash-money-intake[/url]. Not sure if that's accurate for PC games, but I'm certain that would still hold for gaming revenue.
Almost got it, but no. This is only about Gog now selling old classic versions of MS Excel spreadsheets, from 97-xp. : )