The Abu Dhabi Grand Prix was the final race under the current aerodynamic regulations, prior to the changes designed to make it easier to for cars to follow by reducing turbulence and complexity in 2019. There was not a great deal of overtaking in 2018 and there's no reason to expect a dramatic change next year even though there could be a slight improvement.
For 2019, there are lots of changes, and the good thing is that most of them are visible to the naked eye. When the then-new V6 turbo hybrid engines came in for the '14 season, there were some changes to the car but most were invisible. When the cars start to appear ahead of next season it will be easy to see the different approaches taken by the teams.
The changes include a wider and slightly taller front wing, with a reduction to a maximum of five closed wing elements. This means the removal of all the forward-mounted turning vanes and a change to much simpler front wing endplates.