The new look for Calendar is now the permanent interface for all Google Apps domains and users. 

Release track: 
Rapid & Scheduled

Editions included: 
Google Apps, Google Apps for Business, Government and Education

Languages included: 
All languages supported by Google Calendar

For more information: 
http://support.google.com/calendar/bin/answer.py?hl=en&answer=1351806
Resources for users here.

The following new features are now available in Google Spreadsheets:

- Sparklines: These let you display line or bar charts inside of cells and are useful for presenting and comparing data in a simple, in-cell format.
- More chart options: New charts and options including different Y-axes on either side of the chart, formatting options for the axis and title text, and other customization for how lines, bars, or pies are displayed.
- Keyboard accelerators, mnemonics and shortcuts: Keyboard accelerators let you open menus using special keyboard shortcuts. A mnemonic lets you choose a menu item with the stroke of a single key, and it’s indicated by an underlined letter in a particular menu. After you open a menu using a keyboard accelerator, use a mnemonic to select an item in the menu.
- Sharing forms on Google+: Share forms created in Spreadsheets easily by sharing directly to your circles in Google+.

Release track: 
Rapid & Scheduled

Editions included: 
Google Apps, Google Apps for Business, Government and Education

Languages included: 
All languages supported by Google Spreadsheets

For more information: 
http://googledocs.blogspot.com/2012/02/january-in-review-styles-sparklines.html
Sparkline: http://support.google.com/docs/bin/answer.py?hl=en&answer=2371371
New chart options: http://support.google.com/docs/bin/answer.py?hl=en&answer=190676
Keyboard accelerators and shortcuts: http://support.google.com/docs/bin/answer.py?hl=en&answer=181110

The following features are now available to domains following the Scheduled Release track:

Calendar: The new look for Calendar is now the permanent interface. Resources for users here.

Docs: Customizable styles - You can restyle all your regular paragraphs, headings, or titles with just a couple clicks.

The following features are intended for release to these domains on Feb 7: No new features to announce

Release track: 
Scheduled*

Editions included: 
Google Apps, Google Apps for Business, Government and Education 

For more information: 
http://support.google.com/docs/bin/answer.py?hl=en&answer=116338