WHERE????!!!!!!!!!!!Nope, sighax and ntrboothax/magnethax have been confirmed to work.
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The only New2DS aspects would be the settings (Saying games can only be displayed in 2D, like the O2DS) but not really.The current titles of 11.4 have already been poked through and there's no evidence of any new2ds specific aspects.
CFG_GetSystemModel() doesn't have a value for the system, for instance.
It could be Nintendo just decided to make a stealth, new2ds-only update of 11.4.0-37, weird as it may be.