The page with the Android 11 Dev Preview listing told developers to get their apps ready for Android 11 further stating that the new version of Android will have even more stronger protection for user privacy.
The page also mentioned that there will now be extended support for foldable devices suggesting that event Google might have something planned for maybe a foldable Pixel smartphone.
The entire site for Android 11 Dev Preview has been taken down for now and it carried no important information that would interest the end user.
It is safe to assume that Android 11 Dev Preview must be ready although Google won’t be releasing it anytime soon as the company usually makes a new Android version official at the Google I/O event which takes place around May after a lengthy testing process.
For now, the Android 11 Dev Preview page redirects to the older Android 10 Developer Preview after being taken down.