The scuttlebutt around Zack Greinke these days mostly has to do with trade rumors. Considering he's a free agent after the season, and that the Brewers have been terrible this season, it makes a lot of sense that the Brewers would flip him for shiny prospects.
The problem is that Greinke is good at baseballing, and he's been the best pitcher for the Brewers this year. The Brewers would love to keep him, and according to Jon Heyman, they're going to make a concerted efford to do so:
The Milwaukee Brewers are believed willing to offer close to $100 million over five years to free-agent-to-be Zack Greinke, according to a person familiar with their thinking. But people close to the team hold little hope that Greinke will sign in mid-season with the Brewers to pass up free agency.
It's still exceptionally likely that Greinke will wait for the bidding war of free agency. But whether the Brewers trade him away or not, this might be a sign that they'll be one of the participants in the bidding war.