Well this is a bummer. It appears there will be no BWW Blazin' Bonus this year. Rather, Buffalo Wild Wings is offering a fixed $5 Bonus "Coupon" with every $25 spent on gift cards between Nov 20-Dec 31, 2017, in-store or online.
There doesn't appear to be a way to get the $5 Coupon thru regular mail/without purchasing $25 in gift cards.
Bonus can be used for food and non-alcoholic drinks from Jan 1-Feb 28, 2018. Limit of 4 bonuses per person.
I saw the in-store flyer today but couldn't find the Ts&Cs online yet. Maybe this store put the signs out earlier than normal/before they've updated their website.