Check out this communally gathered data: https://docs.google.com/spreadsheet/ccc?key=0Ajc_VqH8uv38dFd...
Apparently, all of the big red letters at the end of the trails spell out "APRIL FOOLS". The smaller red letters and numbers spell "MMC-900913", which is a reference to last year's 8-bit map.
In this video, you can see MMC-900913 printed on the a controller chip at 29s. http://www.youtube.com/watch?v=rznYifPHxDg&feature=youtu...