Just flew on AA today from ORD to IAH. Out of curiosity, I read through the in flight magazine, and checked the in flight prohibited electronics section. Yup, they updated the magazine. It says;
"Devices that are not allowed to be activated at any time are those, including e-cigarettes, that could cause damage to equipment or diminish the design, function, or capability of the aircraft."
The sad thing is that e-cigs don't fall into any one of those categories.