Here's a brief summary of the major changes between the GF2 and GF1:
Smaller and lighter body LCD screen now touch-sensitive Fewer external controls (mode dial, drive mode lever, AEL and DOF preview buttons removed) Completely revamped, fully-customizable Q-menu designed for touchscreen operation Built-in stereo microphone 1080i 60fps full HD video (from 25p sensor output) Continuous shooting at 2.6fps with Live View Increased maximum sensitivity (ISO 6400) iAuto button on top plate Variable 'Peripheral Defocus' control in iAuto mode, with live preview Full support for F-FT012 3D lens No remote release socket 2nd curtain sync and flash exposure compensation no longer available New smaller DMW-BLD10 battery with slightly lower capacity (7.3Wh vs 9 Wh)