It's in reference to the YC job ad at https://news.ycombinator.com/item?id=4332117 posted an hour ago (after the AllThingsD article was submitted). The first paragraph claims that they "can't go into too many details about the exact features of [their] software".
EDIT: This might have been an old job ad that was reposted, as it claims the company has 8 employees, while AllThingsD states they now have 55.