As detailed in the developer diary below, update 2.0 adds «20 technical enhancements», various gameplay tweaks and a number of major new features. (eurogamer.net)
In the new further improved 4.0 version, the company has added several major new features in the library and the shop, in addition to many minor upgrades and improvements in stability. (goodereader.com)
Major new features include hands - free calling, Bluetooth support, and visual responses. (9to5google.com)