If bungie add more emotes in, it would be good to have class specific ones to differentiate the classes or subclasses more, for example, a gunslinger could taunt by spinning the golden gun on his finger, warlocks could have a ball of magic I'm their palm, blade dancers could do knife tricks like balancing a knife on their finger or something. Just to add a bit more character to the classes/subclasses
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I've seen people asking for menus that expand from the d-pad but honestly that just seems obtrusive to me and I can imagine it looking horrific on the HUD. Personally, I'd rather the ability to assign the emotes to the three hotkeys from the character menu as that is where the rest of the character customisation occurs.