Now you can export HTML5 directly from Adobe Flash CS6.

All you need to download Toolkit for Create JS from here:

http://download.macromedia.com/pub/flashpro/ToolkitForCreateJS/1_0/Toolkit-for-CreateJS.zxp 

Now, install it with "Adobe Extension Manager CS6"

Open flash, create a new file then go to menu - Windows>Other Panels>Toolkit for CreateJS this will open a dialogue box.

Create some quick animation and hit the Publish button from "Toolkit for CreateJS dialogue box.  (it will save files in My Documents by default in XP/Windows 7 - don't worry you have an option to choose desired directory)

It's a first release so, don't expect too much from it, but still it's good.

some useful URLs :

Using the Flash Professional Toolkit for CreateJS 

http://www.adobe.com/devnet/createjs/articles/using-flash-pro-toolkit-createjs.html

Getting started with the Flash Professional Toolkit for CreateJS

http://www.adobe.com/devnet/createjs/articles/getting-started.html

Enjoy!

Avn