Ok so there is dribs and drabs leaking from the Activision arena atm.
First for UK Virgin media customers there is reported to be a limited edition sparrow.
When the site goes live (currently it isn’t) virginmedia.com/redeemsparrow (has to be accessed via your virginmedia connection) will allow you to get this sparrow.
Next up in the UK rockstar energy drinks are going to run a promotion for in game items via codes on the cans and this site :- https://destiny2.rockstarenergy.com/
And lastly it appears the USA is getting a promo with pop-tarts (that “healthy” breakfast/snack) again via codes in the packs but these are only for XP boosts and not reportedly for any in-game items. The site for this has yet to be announced.