I was hoping that, since Kimbul showed up, we would also get to see the other tiger loa, Shirvallah. Maybe also Bethekk, the panther, introducing new big cat models based on the trio's.
@Jani's gender: I think Bajiatha, the rare saurid matriarch, is meant to be his mate, just like Loque'nahak is Harkkoa's.
I also believe that Xolotal and Agussu may be loa too, based on their names. (And that the former literally has an avatar.)
What else did I wish to mention?...
Oh yeah, the fact that Rezan's mother is a death deity too, which explains why out of all the loa, he is the one who can prevent Bwonsamdi from claiming a soul. Well, him, his mother and probably Mueh'zala