Well.. there still aint no proof. And "Raping litecoin for months" ?? That's total bs, that 6990 uses at least 350Watts. On my cpu's I do about .5 kh/s per watt so the gpu is only 42% more efficient per watt. Even if this is true it's not a big story really.
Firstly you don't know how many watts it uses to mine scrypt, secondly this is early days (hours even). The original SC GPU miner is about 50% slower than what is available now. And future versions will likely extend that for SolidCoin.
As to scrypt, anything between 50% and 200% increase over what is there now wouldn't surprise me. You can pretty much kiss scrypt mining on CPU goodbye because unlike the custom SolidCoin algorithm it isn't a good all round choice for both GPUs and CPUs on a watt for watt basis.