I am curious to see what Apple will reveal in this event.
I suppose laptops are in a turning point now, much like they were in 2012 when Apple released the retina MacBook Pros. At the time, laptops were all becoming thinner and lighter following Apple's lead with the MacBook Air. DVD-ROM drives were being dropped, and the screens were becoming notably better with a move to IPS and to higher resolutions. Apple then released the retina MacBook Pro and met the expectations of what would be the next wave of laptops.
In 2016, not so much. Laptops were becoming thinner and lighter and overall better as a natural evolution of previous years. Some gimmicks had become more popular, such as 2-in-1 laptops or detachable keyboards or second screens. Apple then released the MacBook Pro with the Touch Bar, which is certainly an evolution but missed some targets. The Touch Bar was Apple's own gimmick, and it did not met the expectations of users. The butterfly keyboard was also not well received.
Now it seems to me that laptops may be on the verge of rapidly evolving again. Apple's push to its own silicon was a wake-up call to Intel, Qualcomm, AMD and others, which are now more willing to make up for their sluggishness over the years. These manufacturers are eventually going to come up with better processors which will fit better PC laptop designs. Some laptops are going to be equipped with OLED screens, some with a refresh rate higher than 60Hz. These PC laptops are yet to become a reality, but, if Apple wants to keep its next design for the next 4-5 years, then it should be able to come up with something to face this future competition.