ETA on an ETA?

Yeah, okay... this is quite a silly question, but please could you help me out here? Do you have any idea when you'll know when you can get the Corsair TWIN2X4096-6400C4DHX memory in (LN21658)? It's just that I've got an order in the offing for a new build and it's the only component that's out of stock.

I don't want to have to put in a parallel order on Ebuyer and wait the 5 days for it to arrive whilst having all the rest of the bits arriving on next day delivery from Scan and sitting there doing nothing, but if you don't think they'll come in within the next week I'll have to bite the bullet.