I received the light this afternoon. I have only been able to shine it on my bedroom wall and compare it to my L800. The construction is all but identical to the L800-that is it is solidly built. The only visible differences are the new light to show battery status, the switch on the rear looks a little different but works the same, it now has a built in ball mount, the red filter now screws on top of the lens and the lens is sort of frosted so a diffuser is unnecessary. I compared it to my L800 with the diffuser on for that light. It definitely has a wider angle of illumination and seems brighter than the L800. You can tell that this light is a little warmer in colour than the L800.
I am not sure if I like the new red filter. It is now inside a mount that screws onto the light like a filter on a camera lens instead of the rubber mount that you simply slipped over the end of the light. I liked the old mount because you could put a thread through a hole on the side of the mount and remove it without fear of losing it. There is no way to attach the new filter to anything. This is a better mount but maybe not as practical as the old mount It will make it more of a nuisance if you want to change from stills to video. Incidentally, the new filter will start to screw onto the L800 but will not screw down completely. It seems to screw down sufficiently that it cannot be lost.
You only get one battery with this light and the new charger is supposed to be faster but I haven't tried it yet. However, for $179 this is a quality light. If it had the old red filter (and I have managed to lose my old one) it would be perfect as far as I am concerned given the price point.