I know that Lambda is busy building illuminators every day but also has full time job and kids. I can assure you that he is working as hard a possible to get every one that wants one to put one in thier hand.
As far as colors, I have no idea I know he has made a green and a black.
As far as battery combination. on the regulated illuminator, the more expensive duracell ultras and energizer e2 give about 30% more run time with near constant brightness thru out... If i were you, i would not worry about what battery you are using but would just keep AA handy. I personally think that the el cheapo dry cells (i.e. not alkalines) can deliver current better with the trade off being a slight decrease in run time for a more constant brightness. These drycells are soooo cheap to me it doesen't really matter unless you are using it in a constant on function for hours at a time.
I hope that i have helped you Geoff, and pardon me lambda if I have stepped on your toes in trying to address some of these questions, i feel that you would rather be building lights rather than fielding questions.
I know that he has gotten over 200
emails asking for illuminators!!