On the 07 I could have sworn a couple I had seen the leds went blue when cooong and orange for heating on the button itself - is this correct or am I going nuts? Current stable:
2006 BMW M6
2007 4.2 V8 S/C FF
Gone:
2002 4.4 V8 FF

On my 08, the lights around the outside go blue for cooling and red for heating but the 2 in the centre stay orange.

Great must be nuts then! Current stable:
2006 BMW M6
2007 4.2 V8 S/C FF
Gone:
2002 4.4 V8 FF

 2010 L322 3.6 TDV8 Vogue Stornaway Grey