I just read an article in a Dutch newspaper (http://www.telegraaf.nl/buitenland/54233631/Chinezen_leren_glimlachen_voor_zomerspelen.html?p=6,2) which commented that the Chinese volunteers are getting lessons in smiling.
During my last visit to Beijing I could recall quite a lot of smiling faces. However, the bosses have decided an people are going on smile training. Interesting to know is that the majority of volunteers are university students, which are brushing up their english big time.
Walking around as foreigner will definitely get you some attention of people that want to practice their english. Lets see the results in 2 years :)