As mentioned recently, today PS3 Firmware v2.01 Update is now available via Network Update or from the download links below:
Download: PS3 Firmware v2.01 Update (US) / PS3 Firmware v2.01 Update (EU)

Update: jabberosx has confirmed for us HERE that rendib's belief is incorrect, and PS3 Update v2.01 does NOT currently support DivX yet.

Also, EckoUnltd shared with us the official v2.01 change log via PlayStation Blog:

• Stability during playing some PLAYSTATION 3 format software has been improved.

• Stability of System Software including Internet Browser and Information Board has been improved.

• Stability of the upscaler for PlayStation 2 format software has been improved. (Playability of PlayStation 2 depends on model)

• [Remote Start] feature is changed to avoid unintended power on.

Although an official changelog is not yet available, it's believed both the Assassin's Creed issues are fixed and DivX support is now added per rendib's submission HERE.