First thing I would like to say is: Welcome back! I am happy to see that WayofTime and Blood Magic are back for 1.16.

The question I have is: Has any of the new Vanilla stuff been added for the Incense Altar?

The most recent guide I have been able to find is this one for 1.8.9. I would like to update that post with more current information, but I don't actually have the new information in order to do so. I was thinking Coral blocks, the nether plants, etc

Looks like they added beetroot to the list. The new Nether Nylium might work if it is considered netherrack blocks.