It does seem like Halifax is slowly updating their card designs. I think there is a new credit card design somewhere and they have a similar design for their 11-15 year old account.
Source - Money Smart | A Savings & Bank Account For Kids | Halifax
It is better than their current design but I don’t like that the Halifax “X” is on it twice (the logo itself and in the centre). Some cards can get away with this, but this design doesn’t.