PubMed will be getting a new look in 2020. You should see major improvements to how PubMed looks and performs, both on your desktop and mobile devices.
You can preview the new interface at PubMed Labs.
The current timeline is for PubMed to be switched to the new version in 2020. Old and new PubMed will run concurrently for a few months, and then old PubMed will be retired at the end of the year.
Of course, these dates could change and we will keep you updated.