Hey guys, We are almost there! In order to smooth the transition you should not wait for the block hash to ready yourselves for the launch!
Primarily we'd like to see you guys generating the genesis block before we know the block hash!
To do this run the script while using a dummy 32byte hex number as extradata. This will gather the balances to be included in the block and cache them so not everyone is trying to download them at once. Then you can re-run and generate the JSON file much more quickly when you have the real hash. You can also use the optional flag --insight if you're finding it slow to gather your transactions. Guide to do this is here
Good luck everyone. And please make sure you check out the last minute notes from Stephan "Tool-man" Tual.