S5 Klance
Before I start, I want to get one thing straight. I get a lot of Klance shippers may be upset because there was "a false claim of LGBT representation". In case you didn't know, Voltron isn't over yet. Lance is DEFINITELY going to get more character devolpement (possibly pertaining to his sexuality), all we have to do is wait.
That being said, I definitely feel like there is going to be Klance development (romantic or not) in S6. Keith went to the BoM for one thing: to find out more about his past. Now, he has his mother, which is his key in. In addition to this, Keith, being the emotional person he is, is pretty empathetic when it comes to potential victims, something that the BoM clearly does not tolerate. In result of this, Keith might start to pull back from the BoM and decide to join the main Voltron team again, retaking his place as a paladin (coughcoughShiroIsDonezocoughcough), or taking on a more diplomatic role.
As for Lance, his arc is obviously being centered around becoming more leaderly and diplomatic, working on his insecurities and coming out of them. By now, we all pretty much confirm that Shiro is a clone, so Lance is probably going to begin working against him, whether it be by simply killing him, or trying to get answer out of Kuron. Keith is DEFINITELY not going to like this. After some bonding and understanding of each other, I think Klance's feelings will begin to show. And considering how insecure Lance is, he will probably have to work through some more identity issues.
So what's going to happen is:
• Keith is going to rejoin team Voltron, having a closer (and HOPEFULLY secure) bond with his mother
• Upon returning, Keith finds out Lance's suspicions about Shiro. He will obviously be in denial at first
• Some shit happens revealing Kuron. Keith is devastated once again but has Lance & his mother as support. They possibly seek out (real)Shiro
• After more bonding resulting from the reveal of Kuron, Lance may start his sexuality arc
• Lance is in denial about liking Keith, yadda yadda, has to come to terms with himself and sexuality
• Klance kissy kissy smoosh smoosh