My friend found them, their human resources page on their website is in spanish. He speaks it, I dont. But you have to log in to their job page on their site to eventually find where the minimums are. Pretty hard to find.
From what I know ICAO as of March 2008 will require a much higher level of English fluency amoungst all of their aviation staff, not just pilots. It won't be good enough to speak in aviator-ese, you'll need to be fluent in writing, reading and speaking English. Many accidents have been attributed to language issues. COPA is expecting a turnover. I hear that the 2P or FO requirements are low, but the Captains are all 30 years plus experience, retired types.