Difference being that the Vega card has double FP16 compute, and 1/16 FP64 VS the TitanXp's single FP16 and 1/32 FP64.It is in same niche as Titan Xp.
I'm guessing Frontier belongs to >$500 spot on this picture.
Also no gaming driver for this Vega card according to Raja. It's more of a glorified Quadro equivalent really.
It will be interesting to see how they fill the gap between RX 580 and that $500 limit for enthusiast.
That image shows $200 and then $500 upwards.