Okay, I can answer this too.
First 200 blocks had mininmum rewards: 1 + 1d4 bonus (so it's 2-5 coins per block). We decided to do that as an instamine protection. First ~150-170 blocks moved really fast (because mined a genesis block few hours before) but after it adjusted and blocks become much slower. We started pool at block 230-250, because it was really hard to get the coins by solomining. 1-1000 blocks had lower block time, so all coin supporters who tracked the coin development will be the part of "launch party"
Now regarding the ninja aspect. I had Pre-Ann threads on 4 separate forums:
https://bitcointalksearch.org/topic/pre-annbdcthe-birth-of-black-dragon-coin-unique-scrypt-jane-fantasy-coin-520737
https://cryptocointalk.com/topic/8390-ninja-pre-annbdc-the-birth-of-black-dragon-coin-scrypt-jane-fantasy-coin-with-unique-features/
http://forum.blackdragoncoin.com/index.php?topic=20.0
https://forum.btcsec.com/index.php?/topic/7682-pre-annbdcrozhdenie-chernogo-drakonascrypt-jane-fentezi-koin/
we also have twitter, facebook, freenode IRC.
I posted a hint on all resources several hours before the launch, so all who's watching coin will understand that launch is near.
Finally I made a ANN thread on bitcointalk.org 15 minutes before launch and again posted info on twitter/facebook/other forums/IRC.
I loved the launch. Perfect way of doing it to reward people who were interested.
Exactly, I was watching and was pleased how painless the launch was of this coin. Thanks Dev!