Nope, not yet. Right now you can install PaleMoon in two ways:
1. Download the installation script and run it as root
2. Grap the package and follow the installation instructions manually
Upgrading is as simple as running the script again once the update is out.
I can look into packaging, but there are other things to be done (like getting flash faster) which I think are more important.
Besides, I'm not sure I'll have the ability to run a proper Debian repo, much less getting my package accepted in packages.debian.org/wheezy/armhf/