Finally that extra vehicle pack for bikers that every GTA Online fan has been waiting for has been added to the game (thus pushing Foreign City of the Week over to tomorrow). If you haven't seen mention of this on any of Rockstar's platforms, don't be surprised — at the time of writing the official announcement has not yet gone out.
The vehicle in question is the all new Nagasaki Shotaro, or as the community calls it, the "Tron-bike". True enough, the vehicle's design takes many cues from the light-cycles featured in one of the most iconic Sci-Fi movies of the 80's — and one of the most disappointing reboots of the 10's (It did have a neat soundtrack though).
In Tron, the light-cycles leave behind them a permanent energy-trail which acts as a wall. Competitions see four drivers placed in the arena for a last-man-standing battle. If you collide with any of the energy trails, you're out. The energy-trails of any competitor who crashes disappears with them.

While such a feature would have been more than interesting in GTA Online, it probably would have thrown balance to whack across the board, which is why the Nagasaki Shotaro does not emit an energy trail. That said, the Tron aesthetic is still all there.
Interestingly enough, the Shotaro is tied to an unlock requirement, which is why you won't immediately see it in the stores if you log on. The bike was released alongside an all new Adversary Mode called Deadline — which is basically exactly the same as the light-cycle duels in Tron.