I've bought the Deluxe Edition of ES2 but so far I can neither find the soundtrack nor any way to change the Cravers' ship skins. Nor have the 2 special heroes showed up so far.
So my question is this: Did I miss anything? Or did I download the wrong stuff on STEAM? (Is that even possible?) Or is it just not in the current build?

Okay, so those were technically four questions but still... The way the Deluxe Edition is presented on STEAM I expected it to be part of EA. If not it may need clarification before somebody gets upset by it and does silly things. ^^

I bought it as well and didn't see those items. 

Based on what I read on steam the skins and sound track will be unlocked later on in development. But that's just from the comments and not from an official dev.

http://steamcommunity.com/games/392110/announcements/detail/841436358925234477

- Capt'

Steam buyout page of the game clearly says that all those bonus "will be unlocked during early access" (except Endless Space 2 Founder Badge which is alreay available)

So just wait and see ; guess we'll soon have an update with related informations