I have a few assumptions, looking after previous conversations and discussions during some of the events:
1.
Talismans: like AcesHigh said completely new, or those talismans that were previously available "exclusively".
2. Night City
won't have available frontier coins as prizes. After all, it's an end game currency, so if it started giving FC as drop, you could certainly make a month (or not shorter) to earn money for the gods or Alexander Ed.
3. New skull quests. And that's where we could get listed above Frontier Coins. I once asked developers whether there will be a different, constant opportunity to receive currency, rather than by unpacking designated souls. The answer was "Probably, we're thinking over other ways to get Frontier Coins". Either we will be able to farm FC there, or in Silent Planet (my other guess).
4. New 4* and 5* characters. Looking at the design of the city, I do believe we are going to get new eternal-like boss / character, a demon, to be precised, one you can see at one of the Lotb game posters
Attachment 4984
What about the Samurai and bear like characters? I don't know, we might get them later this month, judging by the samurai / japanese theme of this month's events.