Can't reveal source - but the new nintendo will not work with gateway for the forseeable future.
You can still get the old 3ds for great value - so if you really need this free game option (and I know there are poor people who really have no other option) buy one of those older 3ds models. Sky3ds will almost certainly be blocked soon - and it is not a great solution for multi-roms in any case (too slow switching games, online risk, sdcard incompatibility, save-state corruption etc etc)
"Sources".
Multiple people within the scene already have their own CFWs and kernel access working just fine on the N3DS. Nothing at all is stopping Gateway from doing the same except for new encryption which Nintendo might bring up, in which case they'll probably get around it one way or another anyways.