What About the M3?
With Apple planning to refresh the Mac Studio with M4 chips in 2025, it's not entirely clear as of yet if there will be an M3 refresh this year.
The iMac, MacBook Pro, and MacBook Air lines have been updated with M3 chips, but the Mac mini, Mac Studio, and Mac Pro are still using M2 chips. With the M4 refresh already planned, Apple could skip the M3 update for its desktop machines, but it's also possible we'll get an M3 refresh around the middle of the year and a second M4 refresh next year, which would put a year between each update.
Apple is testing a version of the Mac Studio with an M3 processor, so an update this year and then a second update next year is plausible.