Read VM below first >=O
The Showcase will finally be a true showcase of hacks. Only hacks that have proven their potential will be given access to it. It'll give people something to aim for because now, with harder moderation approval you'll need to have a quality hack to get in and not just something that simply meets a couple of requirements. It'll also help promote that hacks that truly deserve attention.
The Progressing hacks is that intermediate stage. Most hacks will be there and it's main purpose is to create a distinction between good hacks and excellent hacks (ones in the showcase).
Err, I'm not sure if I covered everything but you can read the rules in each section when they are made.
Yeah Copy&Paste sorry, I'm lazy.