New Version of TI nspire CX II CAS

[toml_12953]

TI has just come out with an update of the nspire CX II CAS with a capacitive touchpad rather than the mechanical one. The new revision has a hardware code ending in AK. I have an AF model which is earlier. Is there a way to tell which revision you're getting from an unopened package? I'd like to update mine but don't want to risk buying another older model.