The whole mission being a flyby with like 20 cubesats flying in wide formation linked up to laser transmitter.
But don't forget that the Sun looks like a bright star amongst others there. Solar panels that work perfectly in LEO are completely useless in those remote regions. It would be like a RTG per cubesat, maybe more if you want to use power-consuming stuff like laser transmission.
So really, power supply is a serious problem there, as you can't rely on light. The other sources of power we have currently are chemical/combustion (from fuel cells to any monopropellant or fuel/oxydizer combo) and radioactive decay (RTGs, nuclear fission reactors) that is converted into heat which is converted into usable electrical power.
Even if we manage to control and use fusion for rocket propulsion, that would be the end of small probes for such long-range missions. Such a reactor would probably be massive, and if we could put that in LEO we could also build a crewed long-range cruiser to house it.
Or maybe we could miniaturize to the extreme a probe, and fire with an orbital railgun at an extreme velocity. But don't expect it to send more than a few pics of the flyby then.
:hmm: