I found this on one of the websites:

A monitoring group was set up on 14th January 2003 to debate the future of the 360 acre site. With close motorway and rail links, there were many proposals including a museum; a multi-purpose sports stadium and an office, hotel and leisure village. In January 2006 the government unveiled a masterplan for the site incorporating many of these proposals, including a 45,000 seat national multi-sport stadium for football, rugby and Gaelic Games. This proposal has raised concerns among sports fans, particularly Rugby and Football fans and online petitions such as the one at "Stadium For Belfast" have been created to run alongside fan surveys.