Laboratory Base Mechanics Explained

I was just going through the menus to see the differences between this game and the previous one and it seems like there's quite a few new features being added both in the base and in the fields.

We have the usual job change one (all with different arts for each heroine, including swimsuits if you got the DLC).
Expand Skill Slots is still the same as before, spend blood to get extra skill slots
Blood Devolution allows you to lose levels to gain extra stats (sort of an end game thing really)
Blood Pack Appraisal/Transfusion seems to be a new one. You can basically gain extra skills (powering up existing ones) based on special types of blood packs you find in your explorations. This is an interesting one as it can make characters even more flexible...

Oh and in the dungeons apparently you can farm blood? Like literally plant it and let it grow over time and then harvest the items that grow out of it. It's actually interesting...