Apollolake (Apollo Lake) is Intel's 14nm SoC for low-cost PC/notebooks, and surely Chromebooks. Apollolake uses the Goldmont CPU core and Skylake Gen9 derived graphics. Apollolake is the successor to Braswell. Apollo Lake systems will be available later in 2016.
Landing in Coreboot Git a few days ago was the initial Apollolake SoC support. "Add skeleton infrastructure for Apollolake SOC. This is the very very minimum needed to compile the code." The work was done by an Intel engineer but by "very very minimum" it indeed contained basically nothing besides preparing the directory/file structure.
Landing today is now the initial motherboard port for Apollolake. It's the basic support for the Apollolake RVP board family with RVP1 and RVP2. RVP1 uses DDR3 SODIMMs while RVP2 uses LPDDR3 and PMIC.
Also landing in Coreboot has been the minimal GPIO driver, an early serial driver, and other Apollolake-related code.
More than likely this early Coreboot work around Apollolake is for reading support for next-gen Google Chromebooks. More details on Intel's Apollo Lake for Linux as they surface.