The official Japanese site for Monster Hunter Rise has been updated with new information and screenshots. This content gives us a look at the player hub and Shrine Ruins. The player hub is called Kamura Village, and you can read a synopsis for the location below.
The Story of Kamura Village
After 50 years, the calamity returns!
This village, known for its Tatara Steel, is where hunters make their living. The Rampage, a calamity that ravaged the village 50 years ago, is about to occur again, so the inhabitants are in turmoil. The hero has to become the best hunter there is and overcome this calamity with the help of all the villagers.
As for the Shrine Ruins, they're described as a “place where people once prayed for protection” but “the shrine has fallen into decay and is now haunted by the roars of monsters.” In the debut trailer, you can spot Magnamalo running around this location.