I'm guessing yu'll be using = for equality?
No, nothing so dramatic; instead adding := as another way to do assignment, allowed in expressions. This is why minimalists would hate it (and not without justification). My real problem making assignment into an expression is that it's really easy to spell == as =, with disasterous consequences. It's really hard to accidentally leave out an = and add in a :, so with := I don't expect that typos will be too much of a problem.