The New Framework, that is currently in preview, is an early look at a new web stack for building Splunk Applications. If you have the experience building Splunk Apps on Mako/CherryPy that is a fine path.
The new framework's goal is to make developing the web views of a Splunk App easier if you are familiar with standard web technologies. With the use of Backbone and Django the new framework provides more infrastructure to reduce the amount of code you need to write within your application. Additionally, use of the new application framework enables the web application to be deployed within another web server if needed.
Splunk application written with the new application framework do have a dependency on the framework. Applications targeting Splunk 5 will also require an install of the application framework to work properly.
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