According to today’s Post Register, the temple will be finished on December 29.
The temple will be dedicated February 3.
“The church’s temple construction missionaries have taught nearly 22,000 (83 percent of Rexburg’s population) about the temple since May 2006, said Linda Frost, one of the missionaries.”
“Church officials said there will also be a monthlong open house for anyone who wants to check it out.”
Well, I plan on showing up. It will be a first time experience for me.
Jesus in Idaho Falls 
Rexburg is just now getting a temple?
Rexburg is growing since Ricks College became BYU-Idaho. From the LDS perspective, this justifies the need for two temples (one in Idaho Falls) so near each other.