Take this with a massive salt but there was a leak posted in discord about the Mole possibly having Size 2 mining lasers while the Prospector would have S1. My first thought was that it immediately puts it above and beyond the Prospector or a small group of them in capability as far as much larger rocks go. Then I wondered if the extraction lasers will allow us to pull in larger fragments during extraction without having to break the rocks down as small as we have to for the Prospector.
After that It seemed logical that we may see some very large rocks now to mine if the lasers really are S2. But they would have to be worth it.
CIG mentioned this in the Friday question and answer video i.e. he Mole will have size 2 mining lasers. As you say what this means we do not know yet but makes the mole a more obvious upgrade.