Ignition needs to be on then in low light the headlights come on, just unlocking the car will not turn the lights on.
No they wont. But you do have guide me home lights. When you switch everything off (leaving the lights set to auto), pull back the full beam switch once. The headlights will stay on for 30 seconds before shutting themselves down. Handy if you parked up in an unlit area.
Cheers guys, that would have been a nice feature to have.