Personally, I think the intolerance I'm seeing in this thread says a whole lot more about the people posting it than it does about the movie. I find it laughable.
I think Lando having a "pansexual" proclivity is simply an interesting twist on his character, rather than some leftist Hollywood attempt to shove anything down anybody's throat. From everything I have read, it is concerning his emotional relationship with his droid. Nothing about it would even justify calling it a retcon. It would just be another facet to this character, that doesn't retcon anything. Sulu was a retcon, like it or not. I've always imagined that Lando would nail pretty much anything that moves, personally. "Hello, what have we here..."
The press might spin it into something more, and writer Jonathan Kasdan may have shown a degree of sensitivity when addressing the question, but that just does not translate into some political agenda being forced on anybody, or slippery slopes going from hot Twi'leks to something that would offend anybody's religious/moral leanings. Frankly, such personal leanings should be kept to yourselves anyway, and not projected onto Star Wars, or the rest of us. This political nonsense isn't supposed to be allowed on this site, anyway.