Aye, tis true.Wiki: "In its first generation, IMA could not power the car on electricity alone..."
This is also true for the CR-Z. Should be updated, since this is no longer depending on the IMA generation.
No, I haven't ever noticed it start differently, however it doesn't give any clue as to what they mean by "cold".So have you encountered it? I wonder if it's another difference between the cars.
I've started up as low as -10C frequently and haven't heard a traditional starter.