I agree with the other comment... but to save you time. No and no. Mistlands is a WIP, the discussions here and announcements show the images of progress. Caves for Mountains is a WIP. New armor and some other homey stuff was added. Something bad lurks in the Swamps. Mistlands is supposed to bring a new biome and other stuff. There will likely be another boss. They also plan to do more for certain existing areas down the line.
https://valheim.fandom.com/wiki/Roadmap & https://valheim.fandom.com/wiki/Development_Plans_for_2021 this link is the old Roadmap for what was planned but they've decided to scrap it and make Mistlands a priority with small stuff to follow after.