So it would seem that CoD dev Sledgehammer are hinting at a announcement sometime soon at GDC 2014. It's still not clear if it's actually CoD related.

They recently tweeted "Practice time. #GDC2014" Along with a picture of what appears to be a presentation rehearsal in a hotel room.

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I could be wrong but I think the guy on the right is Michael Condrey, co-founder, studio head of development at Sledgehammer Games. Not only that but I think he might be holding a console controller by his side (very hard to make out), which could hint at a live demo.

It also ties in with a pic they posted the other day, which states the date and time of the announcement. Although the title is confusing and does cast doubt over an actual CoD announcement, guess we'll find out later.
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As I already said, none of this is confirmed to be CoD related at the moment so this is pure speculation.

All research done by myself.

Also CoD doesn't have a general section so this forum seemed the closest thing. Sorry if it's misplaced.