Hyperloop is a variation on the Vactrain [1], a concept that goes back a long time. The thing that made Hyperloop different was the notion that you didn't need a hard vacuum in the tube -- the air in a Hyperloop tube will be really thin, but it will be there. The other thing notable about Musk's original proposal was that the cars would float on air bearings rather than a maglev track. I think most if not all of the current experimental Hyperloop systems are using maglev technology because it works better than the air bearings would. If Hyperloop systems adopt hard vacuum in the tubes, then I think you can make the case that Hyperloop is not new, it's just re-branded Vactrain. In reality, I don't know that this distinction will make any big difference.
I personally think we will ultimately see some functional passenger-carrying Hyperloop systems, but I don't know that they will be any more successful than maglev has been to date. I don't think we will see any systems using a hard vacuum (the classic Vactrain), because hard vacuums are, well, really hard to do.