Just in case anybody is interested, there is an ccs os x beta available since end of march: https://e2e.ti.com/blogs_/b/msp430blog/archive/2015/03/31/exploring-the-msp430-tool-chain-part-7-code-composer-studio-on-mac-beta-now-available
Just installed and gave it quick try - seems to be working and also talsk to the TI MSP430 USB FET as well as the FR4133 Launchpad.
I didn't find the option to install the TI GCC, so have to run it with the TI compiler right now.