It's actually called 'Rogue' not Scout, and from what we've seen, it's probably going to indeed be something of a 'THF-lite' type class (the lore for the class definetely hints at it). And as for NIN being the Job upgrade, it's not actually that odd (not as much as BRD coming off ARC!), if you've done the 2.2 storyline, which not only hinted at NIN and RGE even then, the storyline clearly touches on just how similar both class/Jobs are. But I digress...