3:22pm: The Celtics and Rivers' camp are "rapidly" coming to believe that no deal is going to be reached with the Clippers, according to Wojnarowski (via Twitter).
2:59pm: Although the Clippers raised the idea of sending Boston a second-round pick as compensation for Rivers, the Celtics are holding out for a first-rounder, tweets Adrian Wojnarowski of Yahoo! Sports. That would suggest that perhaps the 2015 first-rounder mentioned below hasn't officially been put on the table yet. According to Wojnarowski, the two sides aren't making much progress at this point.
12:47pm: The ongoing saga involving the Clippers, the Celtics, Doc Rivers, and Kevin Garnett took another odd twist this morning, when the Celtics sent out a press release announcing that Rivers and GM Danny Ainge would speak to the media today. Shortly after that announcement, the Celtics postponed the press conference until Monday, tentatively at noon eastern, according to Ben Rohrbach of WEEI.com (via Twitter).
As Baxter Holmes of the Boston Globe notes (via Twitter), the unusual move by the Celtics may have been designed to push the Clippers into action. The Clips had previously been unwilling to give up first-round draft picks as compensation for Rivers, but the threat of a press conference in Boston (perhaps to announce that Rivers would be returning) may have changed that, says Holmes.
Hall of Fame scribe Mark Heisler confirms as much, reporting (via Twitter) that the Clippers have now offered a protected 2015 first-round pick for Rivers. If the two sides can reach an agreement on compensation for Rivers, a Doc deal could be completed today, according to Heisler (Twitter link). However, he adds that the same can't be said for a trade involving Garnett. Due to CBA rules, the NBA has essentially insisted that Rivers and KG would have to be moved in separate, unrelated transactions.
To clarify that last point: Because NBA head coaches can't officially be traded, the Celtics aren't allowed to include Rivers in a Garnett deal. Instead, they'd have to release Rivers from his contract, allowing him to sign with the Clippers, making a potential KG/DeAndre Jordan swap an entirely separate transaction.
But the CBA also doesn't allow teams to make two separate moves that are contingent on one another, so the Clippers have shifted their focus to Rivers for now, in hopes of hiring him and then pursuing Garnett at a later date. If the Clips were to land Rivers and agree to acquire Garnett later, they'd have to convince the NBA that the two moves were made independently of one another.