The most recent find onver at http://www.egmnow.com/ has showed another one found in the new map which was released just the other day for Xbox 360 users.
The most recent Teddy Bear has been found in the Piazza map. Other ones have been found in:
Some can only be found when flying around using the freecam mode while spectating where they’ll be an the most stragest of locations or weilding dual, golden desert eagle guns! While others will simple be hidden under a table in a map.
It’s become Infinity Ward’s trademark to do so with these cute little bears so keep an eye out for them in future maps! Check out the video below for the one found in Piazza.
Another easter egg we’ve noticed was on the single player mode when you are in the tube stations. The map of the network has some interesting names on them, some possible hinting at future map pack releases! Check it out here: http://www.callofdutymappacks.com/news/mw3-easter-egg-possibly-hints-at-future-map-pack-content/