The hybrid dinosaur mentioned is known as the Diabolus/Indominus Rex (that hasn't been 100% clarified), and was made with Velociraptor, Tyrannosaurus, snake, and cuttlefish DNA. So we now have a giant, intelligent dinosaur that can camouflage itself almost perfectly, and will kill anything in its way. [Url=http://www.dreadcentral.com/wp-content/uploads/2014/11/LEGO-Jurassic-World-2015-1.jpg]Here's[/url] the official Lego figure.

As for the reason why, the park's visitor attendance was dropping. So they decided to make something new to bring people in.