I've only recently come back to ESO (stopped playing shortly after IC came out). So i have no idea if there is anything planned for it.
Ever since the dye system came out i've wanted ZoS to add a way to change how your current gear looks, and im sure many others do as well. One of the main reason i love crafted armor is because i can choose the motif of the gear. mainly because i dont like how some motifs look in certain armor types. But crafted gear isn't the best in game, usually you want to farm or buy farmed gear off other players, and the motif for that set doesn't look good with what you have or you dont like how it looks. Usually i'd just wear a costume at that point.
But it would be really cool if ZoS added some way for players to transmog gear to look like other gear. I wouldnt mind if you had to buy a transmog stone from the crown store or have them very rare drops. The player would have to have an item or know the motif to be able to transmog the gear they want to.
Would love for a system like transmogging to be in the game and i've wanted it for a long time.
~Thallen~