The Astros traded LHP J.A. Happ, RHP Brandon Lyon and RHP David Carpenter to Toronto for major leaguers RHP Francisco Cordero, OF Ben Francisco, minor league players RHP Joseph Musgrove, LHP David Rollins, C Carlos Perez, RHP Asher Wojciechowski and a PTBNL. Click on the name to see the players stats page. For the full story, see the Houston Chronicle article here.
Three of the four named minor league players were listed in Jonathan Mayo's Top 20 prospect list for the Blue Jays coming in to the 2012 season.
8th - C Carlos Perez was described as a very good defensive catcher (34% caught stealing coming in to the 2012 season) that has some ability with the bat. Baseball America had him at 14th and agreed that, even though he had an off-season in 2011, he has the ability to swing the bat well.
10th - RHP Asher Wojciechowski could be a workhorse starter if he can find consistency with his fastball. He has a plus fastball, above average slider and has a changeup that needs work. Baseball America also ranked him 10th and also cited the need to find consistency with his fastball and repeat his mechanics but thought he had the potential of a #2 starter.
11th - RHP Joe Musgrove is a hard thrower with good sink. He has a pretty good breaking ball and has used a splitter in the past. According to Baseball America who had him ranked 20th, his fastball has a very good combination of velocity and life and he has been known to hit 98.
UPDATED TO ADD: Jonathan Mayo just posted his take on these prospects and included some information on LHP David Rollins here.