EgoGratis, it seems that the only difference would be that you would not need to UPGRADE in order to continue your development install into each next development release (in example...13.10 which is coming up after final release of 13.04)...the updates should be the same as is currently received in development...

Not having to upgrade, means avoiding potential breakage that an upgrade can induce...so that is a good thing...

It's possible they might have in mind to add in some other factors to maximize reliability or whatever, but that's just a guess on my part, and would be worked out in the details...