That Zachary Quinto came out in an interview with New York Magazine isn't exactly huge news. It wasn't a big secret that the former "Heroes" star/Mr. Spock 2.0 is gay.
And, of course, it doesn't matter. It doesn't change him as an actor. And it's not really anybody's business.
If you want to tell people about your sexual preference it's entirely up to you. Other people are making a big deal out of it; Quinto himself almost off-handedly mentioned that he's gay in the interview.