Have the pack-ins worked? Well kind of I guess. People went nutty for the freeze frames there for quite awhile. It worked with the US Weequay although that was more to do with the rarity of that particular carded figure I suppose than the freeze frame itself.
The coins from the original POTF line worked well. Some of those are very expensive on the secondary market....for a "free" coin.
Commtech chips did not go over that well I don't think but you probably have a small number that get into those.
Now we have the holograms. Some people really like hologram figures. I can see it going over better than the commtech chips and freeze frames. Mainly since they are actual characters from the films. I guess it will depend upon how hard they are for people to get who are interested in them. I am sure some peope who would not normally go for the re-packed Barada will by Barada since there will be some holo figure they don't have yet.
Watch the Rebel Fleet Trooper will be the most rare and whatever figure he is carded with will be worth gold