Once again, the regulations have been updated.
2014 Technical Regs
2014 Sporting Regs
The pages 73 and 74 show the changes for 2015, the survival cell behind AA is limited by:
"No part of the survival cell, nor any part rigidly attached to it (with the exception of the panel of prescribed laminate referred to in Article 3.7.9), may lie above a diagonal line starting 525mm above the reference plane at A-A and rising to 625mm above the reference plane at a point 375mm behind A-A"
This addition means that most survival cell shapes will have to change for the next season, the McLaren and Toro Rosso one could stay as they are atm.
Edit: Sorry, it seems i missed the part where it says "with the exception of the panel of prescribed laminate referred to in Article 3.7.9". This means that the survival cell itself has to change and be lower in that area, but a panel above is still allowed.