More details released - valid from 20th until 27th on purchases £10 and more - click through from nectar to activate the offer.
Confirmed with the Nectar Facebook team that the offer will be for everyone from 20th
Just seen this half way down the daily deals page on eBay. 8 x Nectar points from 20th November - might be worth putting off any big purchases until then plus you can also use eBay for your Argos fast track purchases and get 8 x Nectar points on them too. Will be for everyone as its on eBay rather than going through Nectar to see if you have the offer