(written from a Production point of view)
Kre-O is a line of plastic construction toys similar to LEGO and Mega Bloks and is largely compatible with those systems. The Kre-O line was first released by Hasbro in the fall of 2011 with many sets based upon Hasbro-owned franchises such as Transformers and Battleship.
Kre-O Star Trek releases
On February 10, 2012, Hasbro announced that the company would be producing toys based on Star Trek Into Darkness and had plans to release action figures, "role-play" accessories, and a line of "Kre-O" Star Trek sets in 2013.
Preliminary images depicted "Kreons" (the Kre-O equivalent of "Lego People") of Kirk, Spock, and Sulu. A Kre-O USS Enterprise set with a flip-up saucer section revealing the ship's bridge was also previewed. 
A promotional video showing a re-enactment of the teaser trailer from Star Trek was premiered in 2012. In the video, a Kre-O USS Enterprise was seen being constructed at the Riverside Shipyard by Kreon workers.
On 7 May, 2013, Hasbro released a short promotional video for Star Trek Kre-O which was co-produced by Bad Robot Productions with visual effects produced by Kelvin Optical. This short spoof sees the USS Enterprise being dragged through a black hole into the Kre-O universe where the crew comes under attack from a giant starship captained by "Green Spiky Head".
A number of Kre-O products were premiered at Toy Fair in New York City on 10 February, 2013. The line first reached retail in May, 2013.