Metro has posted an
interactive map with the routes under consideration, and the pros and cons of each. It seems pretty likely than the route will be Transit Mall > Tillikum Crossing > SE Powell > SE 82nd > SE Division > NE Hogan Rd > SE Stark, terminating at Mt Hood Community College. It looks like there will be dedicated busways east of SE Cesar Chavez, but not between SE Milwaukie and SE Cesar Chavez.
(I had not previously realized that in Gresham it is possible to have streets with a SE name to the north of streets with a NE name.)