Interesting: The MSP430FR4133 reference designs for a thermostat and a water meter come with BoosterPack headers.
However the pin-out seems to be only partial. At least it's sufficient to use SPI/I2C.
More here: http://e2e.ti.com/blogs_/b/msp430blog/archive/2014/10/16/new-reference-designs-available-based-on-the-new-msp430fr4133-mcu.aspx