Immersion sensors in the new portables

We have just quickly glanced through with the service information (notes from Apple for the after sales service) for the new portables.
Apple has made very big effort to simplify the interventions on these machines, for after sales service and for us, the end user, who will be able to rather easily change the hard drive. In fact, all is simpler except the change of the memory which are now less accessible. It is not only necessary to take out the battery, but also the rest of the lower cover of the machine!
They are only 8 screws to be removed, but this procedure will stop the beginners.
The important thing to note: just like on the iPods and the iPhones, there are now sensors of immersion (two) under the cover close to the keyboard. If you spill a liquid onto the keyboard, they will change color permanently.
[Update] the optical disk is now with SATA format, which is a first for Apple and good news for us. It will become possible to take it out and put a second hard drive instead in this place :)