the info. on their website says about the new lithium version of glo-toob (FAQ and COMPARE sections):
--able to use rechargeable CR123A's in 3, 3.3, and 3.6 volt versions.
--lithium glo-toob a bit larger than current type - but will also be better, brighter, stronger, and will last longer.
--modes still not announced (see my post earlier in this thread on email I received from them, where they said there will be 11 modes - OK, adding edit here - at the bottom of the compare chart they also mention the 11 modes)
--tactile push-type button standard, other types to be circulated (again, in the email I got they said the standard package would have the extra twisty cap).
--size of lithium glo-toob 3.15 x 0.95 inches (vs. 2.8 x 0.75 in largest current version)
--weight, 2.18 oz (vs. 1.27 oz, current largest version)
--runtime 24-100 hrs (vs. 30 standard version, or 30-80 - obviously 80 hrs applied to the slowest intermittent mode of the current version).
It's actually good that at the highest setting it gets 24 hrs, it means it should be a lot brighter than the highest setting of the FX version (or standard setting of the standard version).
Good news, I'd say. Just be careful that you get the extra cap standard (in case its release is a bit delayed).