WWDC 2020 happened on Mon, 22 June 2020, as expected lot of new features announced and are available under the developer beta program. If you want to use them before the actual release follow these simple steps.
Note: As these update are beta there is possiblity of issue like data loss and bugs. so before starting the installation back up your data.
Step 1
Download iOS beta profile from https://developer.apple.com/download/ on your iPhone
Step 2
Allow the browser to install the profile to the device.
Step 3
Go to settings and you will see profile downloaded tab right below your name.
Settings > Profile Download
Step 4
Click install to download iOS 14 and enjoy the latest iOS features.