http://www.ricoh-imaging.co.jp/english/support/digital/k-3-3.html

[Enhanced features]

• • [Electronic shutter] can be selected.
  • When [Electronic Shutter] is selected, a high-speed shutter of fastest speed 1/16000 sec. is supported.

*For more details click here

[Others]

• • Optimized focus operation for new lens HD PENTAX-DA*16-50mmF2.8 ED PLM AW lens.
  • Improved stability for general performance.

*When this update is done, the contents of version 1.02 and earlier will be also updated.