That's the biggest tournament in T20, which comes in every 2yrs.
World cup happens once in a 4yrs, which had last time in 2011, next will in 2015 then followed by 2019 in UK.. Dont confuse WC with World T20..
During world cup, many non cricketing nations shows in their prime news as headline in their sports section. I ve noticed in China, in Malaysia, Singapore, and South Korea but World T20 nobody shows any head n tail of it.
Even CNN, Euro sports and abn covers in their headlines and run a special weekly sports centre about cricket world cup, where as World T20, none of them shows any special coverage neither in their headline.
So, stop spreading this wrong message that 50 overs WC, then 20 overs WC. Even, in ICC website it never mentioned World T20 as 20 overs WC..