I'd have thought that there would be a great deal of pressure to use the World Cup to push 16:9 sets to South-east Asian consumers.
However , the company that will film the matches, Host Broadcast Services (HBS), on behalf of FIFA would appear to be supplying a 4:3 feed with no mention of 16:9 on their website:
"In addition to the Standard Definition 4/3 feeds provided by HBS, a separate high definition 1080i (interlaced digital) clean feed is available for Broadcast Partners.
The high definition multilateral feeds are a co-production implemented by two groups of local broadcasters (the Korea Pool and the Japan Consortium), supported by the Local Organising Committees, KirchMedia and HBS. 48 matches are being produced live, including all the matches from the Second Phase. Most other matches have highlights coverage."
Source:
http://www.hostbroadcastservices.com/