This one is coming out of left-field but uh

I legit think the “Queen of Junkertown” could be the next hero.

Not only that - 

I legit think she could be the next support hero.

A lot of people picked up on the very obvious empty throne (meaning they can keep her design a secret for a later reveal), and the also obvious weapons hanging around.

But a lot of people missed the bright yellow objects attached to the weapons.

Overwatch is super heavily color-coded/color-motifed.  Yes, yes, “blue = good,” “red = enemy,” but beyond that, each character in their standard design kinda shows you their personality traits.  Each character usually has a very distinct 1-3 colors that stand out and makes them immediately distinguishable.

Similarly, there are few extra colors that tell the player or a teammate what is happening.  These are:

• Green = speed (Lúcio’s speedboost, but also the jump pads, friendly Genji’s ult)
  
• Light blue/glowing blue = photo-based shields (Reinhardt, Orisa, Winston, friendly Zarya, Symmetra’s shields)
• Purple = chaotic, “debuff” (Zenyatta discord orb, Sombra hacking, Widowmaker venom mine, Ana damage shot, enemy Ana biotic grenade)
• Yellow = healing and/or bonus armor (Mercy, Ana, Zenyatta harmony orb, Lúcio healing, Soldier: 76 biotic field, Roadhog breather, Torbjörn’s armor, D.Va’s armor, etc)

This is not a comprehensive list by any means, but basically, the majority of the time, when you see yellow in Overwatch, that’s a healing-related ability, item, or object.

If the Queen of Junkertown is going to be a playable character, it’s likely those weapons “heal” somehow, while still providing her with offensive capabilities.