Living in texas, we get some limited cycling news from Mexico. Mexico City is huge, traffic congested, and polluted. All the more reason for more folks to start riding bikes. The government in Mexico City has been starting to push cycling in the central city. There are many parks w/ MUP's. Mexico City has also been holding "Cyclovias", where they close down major inner city streets to automotive traffic, in order to showcase cyclists, their newer culture, their rights, etc...... I remember reading about a large cyclovia in Mexico City not too long ago.

Still, having traveled there, I can't imagine that the cycling infrastructure and/or cycling culture could possibly compare to parts of Europe or the US. Particularly around recreational cycling and commuting. There are some very fast road racers out of Mexico City.