This year, the main thing is a new set of warbond CCUs, which may include some offered earlier in the IAE but not all of them, plus new ones not previously offered this IAE. This is different from previous years, when all the warbond CCUs offered earlier were available again during the final 2 days. See
Intergalactic Aerospace Expo 2952 FAQ - Welcome Back to microTech!, especially this part:
Will there be Warbond CCUs available?
Yes. Check back each day throughout the expo to see what's available. Each Warbond CCU Daily Deal will run for 24 hours only. However, this year’s Finale (November 27, 4p,m UTC - November 30, 8pm UTC) will include a refresh with new Warbond CCUs that will feature only at this time for select manufacturers, replacing the prior daily deal ones.
…and the comments asking for clarification, and getting it:
i seem to recall being told that any quantity-limited ships that had not sold out during previous limited ship sales would go on sale again, but I am not sure there will be any which don’t sell out when they are offered in waves on their manufacturer’s day.