Expected to be released in 2015.
Ranked in these QuestionsQuestion Ranking
Pro Modular design
Pro Will provide a choice of operating systems
While the initial version will ship with Android, Puzzlephone will not be locked to a single operating system with later iterations.
Con Provides less modularity than Project Ara
The phone consists of just 3 hardware modules - "The Spine", "The Hear" and "The Brain". The Spine has an LCD, buttons, speakers and a microphone, The Brain has CPU, GPU, memory and camera, and The Heart has a battery and any extra functionality depending on the module.