Non-spoiling information is that the marriage thing will be (as the game's title suggest) a big part of the game. The marriage quest line seems to be quite big and impactful.
Some lore things, as we can see in the demo already, are real world things redefined. Like pubic hair visible and pregnant-like nipples as a sign of sex experience (a girl is "used"/"seasoned").
Another thing which is not a spoiler, it is in the DEMO already, look:
Pursuers, huh?
And finally, the pictures from dev's blog/webpages - in the DEMO we had easy-difficulty INNs...
CAN'T WAIT