From the preliminary notes:
New retainer exploration venture levels have been added:
Field Exploration XIX / Highland Exploration XIX / Woodland Exploration XIX / Waterside Exploration XIX

New items have been added to Mining and Botany ventures.
New items have been added to quick exploration ventures.
I haven't seen any speculation on this, anyone else thinking this could mean unspoiled 50 items? It would be a huge boost to gardening if that were the case, being able to get grade 3 soils, and also a huge boost to get that old hard to get crap from ventures.