All of the promo content from the Aeon’s End kickstarter is in The Nameless expansion.
All of the promos from War Eternal kickstarter are in The Outer Dark expansion.
There are a handful of KS exclusives from those two kickstarter projects (and other promotional materials).
Under the Add-Ons header, you will find KS exclusive promos from the War Eternal and Legacy campaign.
Only the items listed on the project page are included in the rewards for this kickstarter.