MLB Trade Rumors had a post on Jonathan Villar yesterday, and they pointed out the Cubs had some interest in him at the deadline. I wonder if he might be a guy they'll revisit as a stopgap at second base going into his last arb year. He's been really good this year, but he's been inconsistent enough in his career that he'll still probably be reasonably priced in a trade and salary.
For CF, there might be some options on the trade market. The Red Sox seem like they're willing to at least listen on any of their OFs. The Pirates should pick up Marte's option and then aggressively try to sell. It also seems likely that the Braves will make Inciarte available--Acuna is capable of playing CF, and their top two prospects are better defensive outfielders who are currently in AAA.