I've spent hundreds of bux unlocking just some of the salvage droid items, and I get that there is a pretty consistent theme - Chiss stuff from Csilla, Ewoks from Endor, Wookies from Kashyyk, Droids from the Shipwreck. But I haven't seen anything that would unlock Grand Moff Tarkin or the new imperial level Overbridge. Has anyone managed to unlock these yet, or seen something that might hint that they are unlocked some other way?
Both are now available as rewards for the Imperial Propaganda decoration event which started on the 20th March and finishes on the 30th.
I think Tarkin was 30 or 35 decorated levels and Overbridge was 60.
I've spent 300 bux on decoration droids to get Tarkin and Overbridge. I was saving up for the inifi-lift elevator... Oh well, back to saving. :)
No. All indications are that they aren't available yet.