Pretty much the same except for Replace mode is now 'Insert' And ` or ¬ key (on some keyboards ~, the one below esc) is now console. We also have new GOL.

New Elements:
Same as new BETA elements.(GoL elements)

Hotkeys:
See them here: https://powdertoy.co.uk/Wiki.html?id=hotkeys

EDIT: Beat me to it^