You can view the Nike webpage with the gold jerseys here alongside other alternate jerseys.
The new gold jersey is the first change to the Jaguars uniforms since 2013 when the Jaguars unveiled new uniforms designed by Nike. The primary home jersey is largely black with white numbers outlined in teal and gold. The road jersey is largely white with teal numbers outlined in black and gold.
The first alternate jersey announced, which debuted in October 2013 against the San Diego Chargers, is teal with black numbers outlined in white and gold.
Now, with the second alternate jersey being largely gold, it means that the Jaguars and owner Shad Khan are getting further and further away from the early uniforms which were largely teal with white numbers. If you're a diehard fan of the teal, it doesn't look like Khan is going back there any time soon, although you can see the teal on the outline of the numbers.