Question for OP: the 500M in the graphic - what does that refer to? Just wanted to clarify. Thanks!
Our new maximum # of coins

Ok, that's the *new* cap that comes into being when the new wallet launches. I think I get it now, so the ambiguity in the Specification section makes sense now. Looking forward to the new features like POS. I've noticed that this is implemented seemingly very differently for different coins. Some (eg DEM) although not tested yet, only release a stake yearly; others like CGB function very well and reliably each month. What are the plans for Piggycoin in the stake frequency, and is it distributed directly proportional to wallet size?
The specifications are not updated since we are still working in this "old" blockchain. I will create a new thread when the new blockchain is launched (+-13 days from now).
The Specifications for the PoS will be:
-15% annual interest
-Min Coin Age = 8 hours
-Max Coin Age = Unlimited
This means you need to have some piggycoins in your wallet, after them being 8 hours there they will start to "mint" and you will start to receive transactions (your interest), this interest will equal to 15% of your coins/year.
EDIT: A good FAQ on this is the blackcoin one:
http://www.blackcoin.co/faq/We will have one for piggy posted in our website.