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Important Infos:

The module contains two tiny cores, an x86 (Quark) and a 32-bit ARC architecture core, both clocked at 32MHz. The Intel toolchain compiles your Arduino sketches optimally across both cores to accomplish the most demanding tasks. The Real-Time Operating Systems (RTOS) and framework developed by Intel is open sourced. See below under Firmware for the download link. The Arduino core communicates with the RTOS via static mailboxes to accomplish a predefined list of tasks (interface with PC using USB, program the sketch into flash, expose Bluetooth LE functionality to sketch, perform PWM). The RTOS for Intel Curie is still under development and new functions and features will be released in the near future.
The 101 comes with 14 digital input/output pins (of which 4 can be used as PWM outputs), 6 analog inputs, a USB connector for serial communication and sketch upload, a power jack, an ICSP header with SPI signals and I2C dedicated pins.
The board operating voltage and I/O is 3.3V but all pins are protected against 5V overvoltage.