So the plan is this. First 7 days are surely for the presale bidding, but it will close at a random number of days after that to stop last minute buying.
Coins will be distributed over the next 48 hours while we setup the genesis block, checkpoints, start the network going. During this period there are 2000 blocks with 0 reward. During this period of zero rewards we will release the reference client. That will give enough time for everyone to get setup, configure their pools and get started fairly.