It would appear that the 981 S has Xenon's as standard but without washers; with the optional PDLS you also gain washers:
From the technical manual:
Lights will always be an essential safety feature, but we go one step further by using them as part of an extraordinary styling concept.
Clear glass halogen headlights are fitted as standard on the Boxster. The Boxster S is equipped as standard with Bi-Xenon headlights. On both models, LED daytime running lights and position lights are housed in a separate auxiliary light unit above the outer air intakes. LEDs provide powerful illumination, respond extremely rapidly to driver input, offer a longer service life and have an unmistakable appearance.
LED technology opens up entirely new possibilities for designers. Not only are LEDs capable of fulfilling all the functions of the imposing taillights and third brake light, they are integral to safety and create a look that is unmistakable, day and night.
Bi-Xenon headlights including Porsche Dynamic Light System (PDLS)
The optional Porsche Dynamic Light System (PDLS), which comprises Bi-Xenon headlights with halogen main-beam headlights, a headlight cleaning system and automatic dynamic range control, provides uniform illumination of the road whether dipped or main beam is selected.
The dynamic cornering light function swivels the main headlights towards the inside of a bend based on steering angle and road speed. Put simply, a greater part of the road ahead is illuminated the moment you enter a bend.
The system also includes a speed-sensitive headlight range control function. With adaptive light systems, it is possible for the maximum range of the dipped beams and their lighting power to be adjusted as a function of the speed of the vehicle. PDLS takes care of this automatically in two stages. Stage 1 is the basic position, optimised for driving at lower speeds such as in city traffic. Stage 2 is designed for driving at faster speeds, such as when on the motorway. Another function of PDLS is the adverse weather function. Activated when you switch on the rear fog light, it reduces the effect of reflection phenomena in poor visibility conditions.
Automatic headlight activation
In the new Boxster models, automatic headlight activation is available as standard. The system automatically switches between daytime running lights and dipped beam based on ambient lighting conditions.