Here's a list summarizing some of the key undergoing changes to our library from earlier versions:

Over 150 supported sensor drivers including some industrial grade devices
Improved the JAVA bindings, added a large number of examples for sensors, enabled JAVA builds in Travis CI, and introduced automatic loading for the JAVA shared libraries
Continued to improve existing sensor drivers and to enhance them with the new C++ coding style and exception types
Several cmake improvements to allow building on various Linux distributions and with a newer version of Node.JS
Simplified adding and building of C++ sensor examples via cmake
New sensors: micsv89, xbee, urm37, adxrs610, bma220, dfrph, mcp9808, sx1276, groveultrasonic, ozw

Fully functional and documented JAVA language bindings for sensors with several examples also available
Added standardized exception handling support across all language bindings and updated sensors to use this feature
Sensor drivers are now available and can be installed individually using NPM for Node.js users
Continuous Integration with Travis CI ensures new contributions are built automatically once they are received
API rewrite and improvements for hcsr04, sm130, eboled, loudness
Documentation improvements and code style changes from C to C++
New sensors: hyld9767, mg811, wheelencoder, grovegprs, mpu9250, ssd1306, es9257, lm35, mq4, mq6, mq7, mq8

Introduced RPM package generation feature from cmake via cpack
Performed a thorough documentation review and merged resulting changes, includes last remaining images and grouping sensors by kits
Added support for Sparkfun Sensor Blocks (OLED & IMU)
Fully reworked API for at42qt1070, mpu9150 and lcd classes, while maintaining backwards compatibility for existing lcd displays.
Extended doxygen tags for better integration with automated documentation generators
New sensors: rgbringcoder, hp20x, pn532, sainsmartks, lsm9ds0, eboled

Updated index pages for API documentation and cross-linked them
More images were added for Grove, Adafruit and Sparkfun sensors along with licensing information
Applied a set of patches to improve code robustness
Added support for Grove NFC Tag sensor
Fixed several typos in library and sensor names
New sensor: m24lr64e

Provided automated, updated and comprehensive sensor API documentation for C++, Python and JavaScript
Edited sensor names, library descriptions and doxygen tags for consistency
Fixed the TH02 sensor driver and made major improvements to i2clcd driver
Added new and updated images for numerous new and existing sensors
Started this changelog
New sensors: sx6119, si114x, maxsonarez, hm11, ht9170, h3lis331dl, ad8232, grovescam

Passed 100 supported sensor drivers
Updated header files with new doxygen tags for improved API documentation generation
Added python examples for sensors
Fixed the buzzer and servo drivers for the Intel Edison
Renamed bmp and gp2y sensor classes to be more generic
Completely revamped implementation for tm1637
New sensors: mma7660, cjq4435, adxl335, hmtrp, nunchuck, otp538u, l298, groveelectromagnet, grovecollision, adis16448, at42qt1070, grovemd, ina132, grovegsr, groveo2, groveemg, pca9685, pca9685ss, adafruitms1438, hx711, flex, groveeldriver, mhz16, apds9002, waterlevel, zfm20, uln200xa, grovewfs, isd1820

Passed 50 supported sensor drivers
Starter Kit and Additional Roadshow and Hackaton sensors added
Several examples and documentation updates submitted
Wrote new proper SWIG typemaps for arrays
Fixed the i2clcd write function, improved several other sensors
New sensors: rpr220, rotaryencoder, biss0001, rfr359f, grovespeaker, mq303a, ppd42ns, wt5001, yg1006, ublox6, mpr121, groveloudness, guvas12d, grovewater, grovevdiv, grovelinefinder, ta12200, groveehr, grovemoisture, gp2y0a, a110x, ds1307, adc121c021, enc03r, ttp223, itg3200, am2315, tp401, ldt0028, htu21d, mpl3115a2, lsm303, joystick12, tsl2561, groverotary, groveslider, adxl345, grovebutton, lol, groverelay