The question is whether or not Lego would go with Destiny; by some accounts they've been quite picky about licensed IPs they choose to partner on. Apparently they're not keen on selling Lego that feature guns (the Star Wars sets are a bit more fantastical so are an exception to the rule, and the other guns they sell in sets tend to be more historical in setting).

Yep, they aim to avoid using any realistic weaponry/equipment that largely resembles anything used today in conflicts around the world - anything kids are likely to see in the news or hear about somewhere. Space guns, cowboys and pirates manage to avoid this as far as Lego are concerned, while Halo got a little too close for the most part, I'm guessing. I suspect Destiny is the same, if not closer to what Lego aim to avoid. Unfortunate.