The Cubs have optioned Tyler Colvin and Marcus Mateo to Triple A and called up lefty Scott Maine and speedster Tony Campana.
Maine was sporting a 2.84 ERA in Iowa, striking out 21 in 19 IP, while walking just 8. Hard to imagine he'll be any worse than what he is replacing.
Campana was sporting a good luck line of 342/383/442 in Iowa earning his promotion. I wish him well, but he'll be hard pressed to find enogh playing time and such good luck in the majors(.423 BABIP in Iowa this season). He does bring speed with him, being successful in 8 of 9 stolen base attempts this year and 144/186 for his minor league career (77.2%). Of course, Yadier Molina wasn't playing in those leagues during the same time, so he probably won't see that success translate either.
Colvin did need to start getting some regular at-bats, although it's hard to figure out why he can't get them over Fukudome, Byrd or Soriano. For a team that already hits plenty of singles without walking much and in desperate need of some power, Colvin seemed closer to a cure than Campana, but neither will be effective without regular use.
It's also of note, as mentioned in the comments, that the Cubs are about to begin interleague play at American League parks starting off at Boston this Friday. Barring injury, Colvin cannot be recalled now for 10 days, leaving the Cubs DH options Reed Johnson, Castillo, DeWitt, Campana and Baker or more likely one of those play the field while the likes of Ramirez, Soriano and so forth get a defensive rest day. It's foresight like that keeps a century-plus losing streak alive.
Anyway, the appropriate deck chairs have been moved on this Titanic. May the disaster continue...