Lets be honest here, there is a very low chance of Cassandra being bi if we get 6 romances.
I disagree.
If they didnt made the npc romance lesbian, why they would do her straight?
Cullen is the only confirmed non-companion romance. I think they avoided making him a lesbian for a number of reasons. I wouldn't assume that there will be a female non-companion romance.
Why favour one sexuality instead of being equal to all?
BioWare has said that all PCs (each gender + orientation) will get options. That means access to more than one romance. Speculation that there's *only* two options for straight and gay PCs or that there's an equal divide among non-companion/companion romances is just guessing.
I know some of you liked the "straight tears", but you can bet that there is will be straight woman, gay and lesbian tears.
... really? This is like some Revenge of the Straight Man post.