I have not been able to perceive the changes or unlock the following things, does anyone have any idea?
New Studio Guest: Charlotte.
New With Charlotte and Anna
New With Anna and Adrian.
Viewing post in StarMaker 1.3 Routing Questions (and future updates)
If you want to be able to invite Charlotte, you have to choose Anna Route when you in the Yacht. Only after all the Yacht Events you'll be able to invite Charlotte to the Studio.
As for new Anna Adrian scenes, I can't find any new ones yet except Gaming, Beach & Bathroom on Tuesday, Pool on Monday as well as other spontaneous scenes around the house.