What is wrong with "It will be on Wednesday"? How would one differentiate that from "It will be Wednesday"?
Where does the 'i' prefix come from? I understand that 'to be' verbs are highly irregular in most languages but I haven't seen any explanation of this particular prefix yet.
The prefix matches the one necessary for inanimate class 9 (n-n, singular) nouns. One doesn't use "Ata-" because that corresponds to "He/She will" plus verb.