It seems that for now they are just changing the status of the applications for applicants with CRS > 400. Correct me if anyone with CRS < 400 and application submitted in November has seen his/her status moved from Submitted.
There are many applications under 400 at assessment stage as well.
There isn't any pattern for who's getting picked from the queue or not.
It's just random. We can't do much for now but be patient.