You are just making implications that they're straight just as people thought Anders were 100% straight. We don't know that. I don't think it's fair to withhold information for those who are fans of Cullen and Cassandra. I would rather hear about Cullen's inclusion as a LI now than later. What you're actually doing is telling the developers to ignore the people who want to hear about Cullen and Cassandra simply because what you want is not part of the announcement. I don't even think that the thought about playersexuality even cross their mind when they announce it and mostly just the happiness the news may make Cullen and Cassandra fans feel. As a Cullen fan who would want to romance him as a dude, I'm ecstatic to hear about the news regardless.
I said before that I'm sure they didn't think about it. I understand that and I'm not going to hold some longstanding grudge about it. I'm not saying Bioware set out at PAX to insult the LGB fans. I'm sure it was an innocent mistake. I just think it's more fair to clear it up now that it's been pointed out. And, yes, I think it's more fair to wait until everyone can get the same information at the same time. That's not being unfair. That's being completely and totally equal. Demanding your information FIRST is unfair. Saying, "we should all wait together", is fair.
I'm not assuming they're straight. They might be bisexual, I don't know. That's the point. With past romantic implications towards the opposite sex, though, it's basically a given that they're not gay.