I guess, if it would be an easy thing to do, the maintainer of any libre distribution would be happy to release early the most up to date version of the distro. But that is not the case. There are many users and just a few developers.
Here's an answer of the current maintainer about why not base gNewSense 3 on Debian Wheezy:
https://savannah.nongnu.org/bugs/?39137
