beneficii wrote:
I know the person depicted cannot be currently living. Other than that, I wonder who it will be?
Actually that isn't entirely true.
A living person can be put on a denomination of U.S. currency if Congress approves and the president signs it.
Congress can also change that law...

To date only Calvin Coolidge is the only president and citizen of the U.S. to be depicted on a coin while being alive and president.
This coin above was minted to celebrate the sesquicentennial of U.S. independence in 1926, featuring sitting president Coolidge.
Hamilton ascended to the $10 note in 1929 along with Treasury Building when the current size small note was introduced.
The old $10 is below:
Which replaced this note:
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Something.... Weird... Something...