[Will Valkyr Get A Prime Version?]

To be honest I don't think Valkyr would have the same ability/setting if there was a prime/original version of her. Rather, perhaps a later and not earlier version of her becoming more beserk would be more fitting. The previous one could be a completely different design since she does not have the same rage.

[What Makes You Happy And Enjoy In Warframe ?]

I just enjoy slashing and shooting things up after a long day. It really helps ease the mind.

[Abilities To Change Warframe Gender]

I think the reason a lot of folks prefer to have the ability to change gender is role-play value to an extent. A male player may prefer to associate himself with the warframe he is using. If the warframe is of a opposite gender, this might break the immersion. Also I've had a few times when a few spectators find it odd that a person is using a suit of the opposite gender. Perhaps players find it embarrasing as well?

 

This seems to be a perspective issue. I tend to view the warframe as separate beings being controlled by the player rather than the player actually wearing the suit. Thus, the issue of gender is irrelevant.