It is known that two major Cydia hosts shut down, and we think the jailbreaking is losing the popularity. However, there are always some jailbreaking developers who don’t want to give up.

So far, the number of the iOS 10.2.1 jailbreak users is supposed to be small because of the limitations. Saigon jailbreak only supports iOS 10.2.1 on a few iDevices.

From the website, we deduce that iOS 10.x - iOS 10.3.2 jailbreak too, named Houdini alpha, will be released soon. And Houdini applies to all 64-bit iDevices from iOS 10.x to iOS 10.3.2.

Is that familiar with Saigon jailbreak? These two jailbreaking shares the same developer. But as the result of the compatibility, the developing difficulty would increase. 

However, iOS 10.3.3 is excluded. So many users are looking for iOS 10.3.3 jailbreak would be disappointed.

The ipa file downloading is not available on the website now. As before, if the ipa file is available, you need Cydia Impactor to install it.

But from the tweet of the developer who cooperates with cheesecakeufo, this is not a jailbreak. We are not sure about the security of Houdini alpha, let’s stay tuned.

So according to @cheesecakeufo, Houdini is NOT a jailbreak, so yeah. I have no idea what it is but don't treat it as an upcoming jailbreak, it is not.

— GeoSn0w (@FCE365) November 29, 2017

Update (Dec. 7th)

iPA file is available, check here for more details.