Reaching for the stars, finally - will the young ones among us get pics of Alpha C.?

[Anomalocaris]

Will a probe less than 1KG have the necessary power after 20 years and sufficient signal collimating ability to send useful data back across 4 light years?

That's the question, isn't it...
Even if you send a 1000 of those critters, one every 2 minutes, the individual crafts will be millions of kilometers away from each other. So letting them talk to each other at their destination seems to be difficult as well, and the first ones will have long left the system before the last ones even approach it.

Hmmm, if we can send 1000 of these and ensure they fly in formation, they could create a synthetic aperture size equal to the size of the formation and provide potentially remarkable collimating power for their return signal. But there is still the issue of picking up a well collimating signal of ~1Kw from 4 light years away.