My statement closed yesterday on 8/20 and in checking it out today the additional 1.25 points/$1 spend (up to $8k) was posted.
BRITISH AIRWAYS VISA REWARDS SUMMARY
Avios earned for purchases this period 3,662
Promotional Avios 10,000
Total Avios transferred to Executive Club 13,662
Sadly it appears the bonus is not on top of the regular 1.25 points/$1 spend, but only an additional 1.25 points/$1 spend for the 10,000 bonus points.