The spec sheet says 0x27 with a little footnote stating that some early released units are set to 0x00. I hooked all 8 to an adafruit TCA9548A I2C MUX and ran a sketch they supplied that read the I2C addresses of the devices attached to the MUX, they all came up as 0x00. Pull down resistors are on the evaluation board. These unit will die if supplied 5v, they are a 3.3v device.
I've one of these devices setup right now on address 0x00 and it spitting out pressure and temperature data just fine.
Thanks for the github link, I'll check it out.