The Flash Season 2: 11 Big Questions We're Asking After 'Trajectory'

11. Is Wally A Metahuman?

Jesse's forced by Harry to wear the metahuman detection watch when she goes out, which she's not all-too-happy about given it isn't exactly the latest must have fashion accessory, and it later causes embarrassment by going off next to Barry. 

The timing of it going off is interesting though, as it does so again when Wally appears. Now, yes, there's a good chance that this is because she's still next to Barry and it's just to cause her further embarrassment in front of Wally, but given that Wally West does become a speedster at some point is it at all possible he's a metahuman? 

If so, then there's a big question over why his powers haven't manifested yet, but even if not this seems to be a sly wink to the future of Wally.