Think we'll ever see Reaver weapons?

I think it's actually possible that they get implemented later, since we already see some imbalance sh*t and power creep going on.
However, to be honest, it would just create a lot of subtitutes replicas among the heros. Since you wouldn't have to check specifically for one color to counter another but 2.
Some heroes are just the same except (stats wise) except for their color.

I think we have to see them at some point. I doubt they'll do anything to break the game you're just simply switching your weaknesses on the triangle.

In a canonical FE you can equip a lot of different weapons on some characters so reaver weapons weren't that game changing for exemple the general class can equip axes and lances but even swords and bows in some old FE. In FE heroes it would mean that you can turn Effie as a "pseudo sword user" for example. The arena meta would totally change haha could be fun. Personally, I'd like some beast stone users like Keaton to counter "Horse emblem".

I dont think there would be any point to reaver weapons, game mechanic-wise.
Think about it, the reawer weapons were useful in older FE games because you could carry 3 or 4 different weapons to handle different kinds of enemies, so all in all, the"colour" per se didnt really matter much.

Here, your red lord can carry swords, but if he carries a lancereaver, for example, he just becomes a green instead for all purposes.
Nothing else is modified, since you cant change equips midbattle.
And considering we can all see the animation of the weapons, you cant even catch players by surprise with that.

I most certainly hope so. Ideally, I'd like it if they only switched affinity for the specific weapon rather than the color. So Swordreaver would flip affinity for Swords and Lances, but not for Dragons or Mages.