It seems that teasing future projects in past ones is becoming something of a trend. The upcoming Destiny from the Halo creators was teased way back in Halo: ODST, and now we realise that Ubisoft did the same thing with the upcoming Assassins Creed IV: Black Flag.
via N4G: pc news feed http://n4g.com/news/1206892/assassins-creed-iv-was-teased-way-back-in-assassins-creed-iii
via N4G: pc news feed http://n4g.com/news/1206892/assassins-creed-iv-was-teased-way-back-in-assassins-creed-iii