Image courtesy: http://www.hkmug.org/
Sony Europe just announced the new firmware. You can download it here: http://support.sony-europe.com/dime/DSLR/dslr.aspx.
Let me know if you are happy with the new improvements! Thanks!
UPDATE: Japanese firmware version:
For the A850
http://support.d-imaging.sony.co.jp/download/DSLR/UUnXMtUM/DSLRA850v20.exe?fm=jp
For the A900
http://support.d-imaging.sony.co.jp/download/DSLR/UUnXMtUM/DSLRA900v20.exe?fm=jp