So far no details on transfer ratio, etc. Will it be 1 to 1? Marriott is 2 clickmiles to 3 Marriott points. Starwood points seem more valuable and 1:1 transfer ratio makes you think this has to be 1:1.
I will point out that last time when clickrewards did the double promo, it was only for airline miles, not including marriott or merchandise items, so if they do another, they may not include starwood. Of course, wouldn't it be nice if they did a double promo for the launching of starwood?

we can always hope...
cheers
TG