The E2e and Arc4+ (and Arc LSHP) are completely different animals: a one cell LED that is pure white, has an "infinite" life, and has great sidespill and moderate throw; it fits easily in a pants pocket or neck lanyard,an delivers 22-33 lumens, depending upon the version and setting / the E2e is incandescent (not as white a beam, and needs regular replacement), has great throw and moderate sidespill, and takes 2 cells; it is really too big for a pants pocket or around-the-neck lanyard; it puts out between 60 and 80 lumens. The Arcs are fully regulated, so the brightness is constant; the E2e is not.
I agree that the Arc5 will probably be comparable to the E2e in brightness (lumen output), but will be much smaller, and so an EDC. I'd wait for it to get rid of your E2e.
edward