The TFA release date for China was almost one month after the rest of the world. Plenty of time to realize nobody really likes Finn,and adjust marketing accordingly.
Finn is consistently less popular than Grand Moff Tarkin and Boba Fett. I've even seen him ranked below Darth Maul, who doesn't even really have a personality at all.
It's a poster. You take it to a printing press and ask for a few thousand new ones, it's NBD. If they didn't already have several alternate designs from before they selected this one, it's like an hour of mucking around in adobe CS to make Finn smaller and droids bigger, less if you have the original images on hand.
