On the 7th
of July the WMC logo design was changed.
Its current shape is presented below.

The new design of logo is more simplified, especially in terms of colour scheme to make a greater impression. Additionally, the two central figures have been designed in such a way to evoke connections to historical and traditional aspects of martial arts. Another modification has been made to emphasize the unity of Muaythai around the world – the two overlapping globes has been replaced by the single one.
To see more
information concerning recent changes you can visit the main WMC ‘s website
where it is possible to download the new logo and to read out the General
Chetta Thanajaro’s letter on this topic.
source: http://www.wmcmuaythai.org/2011/07/11/new-wmc-logo