Iridium reactor plating (as for what it does, i'll leave up to devs)
Heat Sink (same as fluid distributor, but for heat. multi-heat in, out to 1 block or vice versa)
short range Air-gap power transmission (think tesla coil, but i think this has been said time an again not to be feasible)
using the wrench on a luminator should change the way it looks.
an upgrade that when present in the replicator, causes it to build the item from pure energy (at a much higher energy-price than UU matter, possibly only 50% of the item can be built this way)