CBS originally ordered 13 episodes. Once those were well underway, they ordered another 2 for a total of 15 in the first season.
There are two schools of thought about this which are hotly debated on the Star Trek nerd forums across the interwebs:
-The conclusion of the mirror universe happens in the 13th episode but CBS wanted to normalize the season by having an adventure or two in the prime universe to end this season and set up the next with another cliffhanger; or
-The mirror universe was too fast-paced as is and was extended to a 15th episode.
I think they'll wrap the mirror universe arc in the next episode and we'll see something to set up the next season, including gold, red and blue uniforms, by the 15th episode.
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