Sometime in the next 24 hours, the HasLab Razor Crest campaign will reach 13,000 backers which will unlock the third "stretch goal" for the campaign. That unlock is a set of the four Carbonite blocks that were seen in the hull of the ship during the first episode. If you recall, the runaway success of the campaign caught Hasbro by surprise, and it was a bit of scramble to get that third, initially unplanned, unlock announced. It actually came days after the second unlock was secured.
It appears Hasbro is a little better prepared this time around. Unlocks 4 and 5 have been added to the bottom of the HasLab Razor Crest campaign page. As of this time, we do not know what they are or how many backers they will require. The first two unlocks came at increments of 2,000 backers, while the third required a 3,000 backer increment.
The unlocks so far have essentially made the Razor Crest better or more complete. I personally hope one of the next two unlocks focuses on a separate collectible, like the Sail Barge Yak Face. That POTF '85 replica Yak Face represented one of the original Kenner collecting grails. I would love it if Hasbro continued that theme, as we've written about here. In fact, there is one such grail that I feel thematically ties into the Razor Crest well: