is there a known deadline/support stop for rails 3.2

Easy question: Is there a known deadline for rails 3.2? ie. no support? (no security fixes and alike)

The point: My application is not "in production" yet, I have do decide upgrade before or after make it official.

The docs say

Before attempting to upgrade an existing application, you should be sure you have a good reason to upgrade.

The only good reason for me would be (at the moment / 2015), if there is no support any more to see on horizon.