Hi,
selectivity is a defining characteristics for cs and ece at Berkeley, no doubts. I am still thinking though as the deadline is till 8th feb. I had applied at control instru and robotics. so, it may not be limited only to cs. Since you mention , that not all have received this email(BTW how many people that you know have applied at Berkeley? and have not received this email, what courses did they select? ), .............. I really have no clue.