The Google Chart Tools team has pushed a new release candidate: April 17, 2012

[visigoth]

We have pushed a new release candidate (RC).
This RC introduces some small features and bug fixes.

Candidate release date: April 17, 2012

Anticipated production release date: May 1, 2012

New features and bug fixes:

• Added a configuration option to control the width of bars in a ColumnChart/BarChart and candlesticks in CandlestickChart
  
• Fixed crash when calling clearChart() twice in a row for charts in the corechart package
  
• Fixed malfunctioning interactivity when calling draw() after clearChart() for charts in the corechart package
  
• GeoChart: New province maps for Estonia, Finland, Lithuania, Latvia, Somalia and South Sudan
  

If your system uses the Visualization API for commercial and / or important production purposes we recommend you test the RC and use the opportunity to provide feedback to us prior to the production release.
If there are any issues, these can be communicated back to our team by replying to this message. 

Enjoy,
The Google Chart Tools team