In no particular order:

Option 1
Use the Master Rollover to roll over the course from last year to this year.
Then, add the new teacher to the same exact course section in the current year. This gives the new teacher access to import the content from the previous year's section.
Note: This works only if it is the same course section as opposed to a different section of the same course.

Option 2
Add the new teacher as a teacher to the previous year's course section. This also gives the new teacher access to import the content from the previous year's section.