The end of the trailer for Star Wars: The Last Jedi does show an outer space battle between the Resistance and the First Order, with numerous ships being destroyed.
While none have explosions quite like this one, this could very easily be another scene from that same fight.
In the upper left corner, we do get to see a bit of the background which would seem to be part of a planet, indicating that this is an outer space scene.
Since the explosion takes up pretty much the entire screen, there’s little else to go on to give us any sort of indication of exactly what it is here that is exploding.