Too long!
Ok, well I've only read a bit about it and it's mostly guesses at the min I think. There are a few mobo manufacturers that are / will be selling them with just a kind of bolt on card rather than built on to the motherboard.
I think there was a problem with the new chip or something. It shouldn't be long for the motherboards now. Just my guess, but I reckon start of next year really.
As for drives, I think this was the first one out: Seagate Barracuda XT ST32000641AS (not a link.. search ya lazy sod before you say anything).
I have seen a few Sata 6GB/s cables about though.
To be honest, I don't think it'll make much odds over HDD's but should do over decent SSD's.
Better?