so if i understand cbuchner right its only a matter of time better performing miners on all platforms will be avaiable
it took us longer than a week and lots of debugging to come up with the new implementation. It took some serious brain skillz too.

And no, we don't intend to open source this.
as i said only a matter of time
keep ur few weeks advantage i dont care for that
i care for longterm mining algo of diamondcoin and if a optimized amd miner would lose all power saving compared to scrypt