The implementation of the new 3D Touch is fairly limited to the newest iPhone devices as it not shows any actions or gesture to the Notification Center and the Lockscreen. The new tweak 3D Touch Notifications takes care of all by adding the great deal of support which is needed to the 3D Touch support for the Notification Center as well as the Lockscreen. This hack is specially designed for the iOS devices which are featured with the 3D Touch function by default and it also works better for the older iOS devices which are running with the RevealMenu tweak.
With the help of 3D Touch Notification any of the users can add the Peek and Pop gestures notifications which are belonging to the Mail, Facetime, Phone, Message and even for the WhatsApp. You are also able to see the preview of the any app after installing the 3D Touch Notification tweak, right from the Lockscreen and the Notification Center by strongly tapping on the App notification. By doing this you can read the message very easy and can take the glance at the information from the LS or NC even without opening the app and you only need to just tap and swipe to get the previews.
In addition to adding the Peek and Pop function to the Lockscreen and the Notification Center the 3D Touch Notification also enables the user to perform the several other actions. To reveal the menu with the relevant options all you have need to do the glance and swipe up. All the features and the functions of the Peek and Pop notifications works properly on the lockscreen except the Mail app as when the device is locked you are not able to receives the previews of the messages. When the device is unlocked the previews works normally on the Notification Center.
This tweak also adds the Peek and Pop notifications for the WhatsApp but you have to download the 3DTN for the WhatsApp tweak free, separately from the Cydia. You will receive the previews on the Notification Center as well as on the lockscreen unlike the Mail app. The users of the iOS 9 with the Jailbroken device can easily download the tweak free through the BigBoss repo.