What do you envision will attach to the utility hardpoints beyond scanning devices? Mining lasers? Salvage claw? Additional weapons?

The utility mount fits equipment, rather than anything offensive, something we're going to be seeing more of as further support and non-combat ships are revealed. The Terrapin's Radar Dish and Scanning Array will enhance the range and capabilities of the installed Radar and Scanner, making it far more capable than one without but as utility gear is revealed, the usefulness of an armored utility platform like the Terrapin will grow.