At the time of his release, Catalanotto had the second-highest pinch-hitting average (.289) among active players. So it's easy to read between the lines and see the Brewers have a spot on their bench in mind for him. You don't sign a veteran like Catalanotto to play on one of your minor league clubs.
If/when he does make the big league roster anytime soon remains to be seen, but the Brewers could use the help. Counsell has been hitting his stride lately as a pinch-hitter and spot-starter, but other than that, the bench has contributed next to nothing. Predictably, Chris Duffy and Casey McGehee haven't lived up to their Spring Training performances. Also, Brad Nelson is lucky to still have a spot on the roster after going 0-for-20 so far this season.
Maybe this signing with help these bench guys pick things up a bit, we'll see. If not, expect Catalanotto in a Brewers uniform sooner rather than later.