CHILDREN OF INVENTION
Written & Directed by Tze Chun. Starring Cindy Cheung, Michael Chen, Crystal Chiu
Plot via IMDB:
Two young children living illegally in a model apartment outside Boston are left to fend for themselves when their hardworking mother disappears.
It's gotten some really good press and won several awards and recognitions in many festivals. It looks to be a good movie, too.
Official Site for screening info.