http://www.digitalspy.co.uk/article/ds14667.html
And from IMDB
"Hulk director Ang Lee could disappoint gay fans by cutting the homosexual kiss between hunky actors Jake Gyllenhaal and Heath Ledger from his latest film Brokeback Mountain. The Day After Tomorrow star Gyllenhaal has confessed that he has had homosexual crushes and is willing to snog Ledger - but Lee is anxious about filming the explicit parts of Annie Proulx's novel about two cowboys who fall in love. Gyllenhaal reveals, "We were talking about the kissing in the movie just recently. Clearly, it's pretty challenging material, but Ang said two men herding sheep was far more sexual than two men having sex on screen."
There are a lot of rumours going about though, apparently the kissing scenes and sex scenes have been shot, it's up to Ang Lee whether they'll be in the actual film. (and if he knows what's good for him, they will be *loads shotgun*)