~1.12% - ProtoShares Holders
ProtoShares owners as at Block 32000 will receive a distribution at a rate of 1 MMC for each 10PTS. With around 1 Million PTS issued, there will be 100,000MMC distributed in this way, and PTS owners will cumulatively have a 1% stake in MemoryCoin at launch. You can import your balance by using your ProtoShares wallet with MemoryCoin. It is recommend that you transfer your balance to a fresh MemoryCoin wallet after import.
Does the memorycoin client download the PTS blockchain in order to do this? Hoping that someone can please explain how this works. Thanks

Before release he gathered all the values of all the PTS addresses(public keys) at block 32000. These were then all honored in the genesis block of MMC. So basically you have the private key to those public keys listed in the MMC genesis block. Just import the keys from your PTS stash, and ta da MMC gives your coins.