In the future, I hope to see a light about the size of a Fenix P3D that has a working voltage range from .9 to 10 volts. This is so you can use different lego body tubes to adapt it to whatever size or number of batteries you want (1AA, 2AA, 123A, 2 123A, 17670s, or 1 or 2 18650s). It will have a forward clickie switch and an optional switch with strobes and SOS as well. The light will have two selector rings on it. One for variable intensity brightness control and the other for color of light (red, blue, green, amber, U.V., and I.R.). Another setting on the optional switch will be to adjust the tint of the white l.e.d., otherwise it will be neutral white. Basically, you should be able to adjust battery type, brightness, l.e.d. color, tint, and other settings quickly and easily. It will also have to be as bright as a million candlepower spotlight (400-600 lumens) and fit in my pocket. I think this will be possible if we can get to about 200 lumens/watt, get a wider voltage range on drivers, get better color rendition in l.e.d.s, and have a company to make it that isn't afraid of making the only flashlight you should ever need. Knowing how companies are, they'll probably hold something back that you want so you'll buy their next light.
Also, I predict that l.e.d. companies will stop pushing the limits of lumens/watt and focus on color rendition to break into the house lighting and car headlight markets. I also think we are in for a price increase for flashlights and batteries. China is becoming a growing industrial nation that will start paying better wages sooner or later. When the Chinese can afford to buy the good lights they make, demand will increase along with prices. Material costs will go up too making our hobby more expensive. I hope I'm wrong about this, but it seems we've had it too good in the last few years. Rechargeable batteries have more than quadrupled from early Ni-CD to current NiMH and Li-Ion batteries and l.e.d. efficiency has increased about the same too. Costs of these batteries and l.e.d.s have mostly dropped over the years as well. I know that as soon as l.e.d.s become a viable option to replace fluorescents, fluorescents will be outlawed here in California whether l.e.d.s are cheap or not. There's too much environmentalist control in California and they already outlawed using mercury in electronics. You can't make fluorescent bulbs without mercury. We may eventually see costs come down a lot on l.e.d.s when they become commonplace in household lighting.