While there are no precise details regarding other updates, which should come at a later date, the company did a short tease calling it "the world's smallest 15.6-inch performance laptop", suggesting that we might see updates in the design as well as the screen.
The new Intel 9th generation Core CPUs and especially the Nvidia GTX 16-series mobile GPUs will give the XPS 15 a decent performance boost. Unfortunately, the company did not reveal any details about updates to the smaller XPS 13.
On a similar note, Dell has already updated its G5 and G7 series with new Intel 9th gen CPUs, as well as new GPU options with GTX 1650 4GB GDDR5 and GTX 1660 Ti 6GB GDDR5 mobile graphics cards.
Alienware notebooks, including the m15 and the m17, will also get updated with Nvidia Geforce GTX 16-series GPUs, but new Intel 9th gen CPUs will be coming to Alienware in June as well.