MONDAY, 2:27pm: The Rockets have waived Forbes and Brockman as well, according to Mark Berman of FOX 26 Houston (via Twitter).
SUNDAY, 12:11pm: The team has waived Johnson, according to his agent, Kevin Bradbury, Mark Berman of FOX 26 reports (Twitter link).
11:20am: The Rockets are expected to waive Gary Forbes, Jon Brockman and JaJuan Johnson on Monday, reports Jonathan Feigen of the Houston Chronicle (Twitter link). All three have fully guaranteed salaries, with two more cuts necessary to get down to the regular-season roster limit of 15 by Monday's 4:00pm Central time deadline.
Forbes is set to make $1.5MM, Johnson $1.089MM, and Brockman $1MM this season, all of which the Rockets would have to pay regardless of whether they're waived. Houston has three players with partially guaranteed contracts, but no one on a non-guaranteed deal.