Apple WWDC event are generally arranged for the developers where new developer tools, APIs, and Other Software stuff was announced. The purpose of the event is to demonstrate new techniques, changes, tools that are built for next generation Apple Products to the global developer who develop apps and games or in other words we can say third party apps developer or company.
Mostly the event occur in month of March, in the event Apple launch their new software, tools, framework as well beta version's of Apple product to the developer as an developer preview this preview are specifically build for iPhone, macOs, watchOS, etc. This preview version's of apple product are given to the developer for the purpose of testing so that they can provide more stable version on the official release of the software(get announced in September and get push to the device in end of September or in November).
At Apple WWDC event apple also announced some of the great hardware as well like Mac book, iPad, iPhone. This hardware might be new or some hardware get refresh as per new configuration, and some are built for compact segment or we can say mid range product for every one.
As per the rumors this year apple is going to announced 13-inch Mac book pro with great spec a s well as a iPad pro , iPhone 9 and may be the next generation of air pod x.
13 - Inch Mac book pro
The 13- inch mac book version gonna get refresh with more storage, 10th generation Intel processor as well as new generation of keyboard that was used in new 16 inch model of mac book.
iPhone 9 or iPhone SE 2
This model of iPhone are build as mid range model of which adopt the design of iPhone 8, back of the iPhone was made of up glass which support wireless charging as also this model may come with A13 Bionic Processor. This model enabled with apple Touch ID bio-metric rather then Face ID.
New iPad Pro
This new iPad pro are gonna come with new 3 camera module that are identical to the iPhone 11 and with the same processor as the iPhone 11.