Jon Lester and Jacoby Ellsbury have been placed on revocable waivers, Nick Cafardo of the Boston Globe reports (on Twitter). Lester will earn $11.625MM next year and his contract includes a $13MM team option for 2014. Ellsbury will obtain a raise from $8.05MM when he goes to arbitration this offseason. He's on track to hit free agency following the 2013 season.
Teams routinely place players on waivers, even if they don't plan on trading them, so this is not an indication that the Red Sox intend to move Lester and Ellsbury. If they go unclaimed, the Red Sox will be able to complete a trade just as easily as they could have before the current waiver period began at the beginning of August.
If a team claims either Lester or Ellsbury, the Red Sox will have three choices. They can let the player (and his contract) go to the claiming team, they can complete a trade with the claiming team, or they can pull him back off of waivers. American League teams will have claiming priority on the Red Sox players.