Preparation for the CNY reunion feast, I’m sure. Whole roasted pigs are used as offerings to the Heavenly Jade Emperor (Chinese: 天公). The pigs will then be chopped up into smaller pieces for distribution to family and friends.
I saw a whole roasted one at my local market yesterday morning:
There are also small suckling pigs, caramelised and barbecued, at another shop a few doors away. These are usually bought as gifts during the CNY season.