They say in the caption:
“Be one of the first to check out the soon to be launched EF 200-400mm f/4L IS USM Extender 1.4x at the EOS Experience Roadshow happening this weekend! We’ll be at Cathay Orchard Cineleisure this 4-6 January from 11am-10pm! See you there!”
Moreover Canon Singapore has posted an image on the their Facebook page showing the EF 200-400 f/4L IS 1.4x.