I don't know why out of all the Fey-types in folklore and mythology, they've never actually used Sidhe as one of them. They've instead tried to preserve branding by using Eladrin instead.
But they've already mentioned that the Eladrin with types like Bralani, Ghaele, Tulani and Coure are back too. I know they existed in 4e in some form too, but they've generally only shared names with their 2e counterparts.
I feel that if teleportation is available as a cantrip, it'll probably only be 5 or 10 feet and either an action or a move to cast.