The 1/3 being Canada's complaint. The complaints by Argentina and the United States remain unresolved.
From the EC press release:
EC regulatory procedures on genetically modified organisms are working normally, as evidenced by 21 authorisations since the date of establishment of the WTO panel. The European Commission has held regular discussions on biotech-related issues with the three complainants in this case – Canada, Argentina and the United States - since the adoption of the WTO panel report in 2006.
The settlement reached with Canada provides for bi-annual meetings between competent services of the European Commission and Canadian authorities on agricultural biotechnology market access issues of mutual interest, including:
• GM product approvals in the territory of Canada or the EU as well as, where appropriate, forthcoming applications of commercial interest to either side.
• The commercial and economic outlook for future approvals of genetically modified products.
• Any trade impact related to asynchronous approvals of genetically modified products or the accidental release of unauthorised products, and any appropriate measures in this respect.
• Any biotech-related measures that may affect trade between Canada and the EU, including measures of EU Member States.
• Any new legislation in the field of agriculture biotechnology.
• Best practices in the implementation of legislation on biotechnology
From the Canadian press release:
"Today’s resolution on GMOs shows that the WTO dispute settlement process works,” said Minister Day. “Canadian canola producers now have greater access to European markets. In ending this long-standing dispute, the European Communities has committed to an ongoing dialogue with Canada on biotechnology that will continue to help improve market access and avoid unnecessary obstacles to trade. This is positive news for Canadian producers of all agricultural GMO products.”
“Canadian farmers are the best in the world at producing healthy, high-quality canola,” said the Honourable Gerry Ritz, Minister of Agriculture and Agri-Food. “Our government always stands up for Canadian farm families, and it is good to see that the European Communities is implementing the WTO panel’s ruling. Reopened access to the European Communities means Canadian farm families will have more buyers bidding on their canola.”
...
In the early 1990’s, before European countries began restricting imports of genetically modified products, Canadian canola exports to the EC showed increasingly strong potential, peaking at $425 million in 1994.
From Canada's perspective, the resolution seems to be all about canola. I assume there was some approval for GMO canola that satisfied Canada, although I did not see anything about it when doing some quick web searches.
ADDED: The NY Times answers the canola point:
Trish Jordan, a spokeswoman for Monsanto Canada, which produced genetically modified canola seed, said Europe approved the last modified seed used by Canadian farmers in March. “All issues for Canadian biotech farmers have essentially been approved,” she said. “That should allow the marketing of Canadian canola to Europe. “