iOS has released with some major features like power saver mode, videopane and so on. You may have been excited to install iOS 9 on your device but you do not want to lose the jailbreak. Don’t worry! You can still get the features of iOS 9 on your current iOS 8. For this you need to be jailbroken. 
If your device has not jailbroken then here’s How to Jailbreak your iPhone, iPad & iPad Touch

All you have to do is install the tweak listed below and you’re good to go.
Make your iOS 8 look like iOS 9

iOS 9 Wallpaper: Dont wallpaper from this link.
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Icon Tool.: Tool
to Rename “Passbook” to “Wallet”.

Cornered: Brings
the new iOS 9 styled alert corners to iOS 8.
ReachApp: It adds
the ability to pput an app into the reachability view for true multitasking.
VideoPane. Detach
videos into a separate draggable pane.

LastApp. It keeps
track of the previously used application and allows you to return to it.



SearchSettings: Search
bar in settings app.


Power Saver Mode. Low
power mode like in iOS 9. Source For Power Saver Mode: “http://repo.hackyouriphone.org/

ShowCase: Displays
lowercase letters.
SwipeSelection.
Select text and move the cursor using gestures on the keyboard.

Emoji83+: Unlocks
all available emoji flags on emoji picker like in iOS 9.
Edit Alarm: Edit
alarms in line.

Record ‘n’ Torch:
It allows you to turn on or off flash light while recording video.
BytaFont 2 : Install San Francisco iOS 8 font like in iOS 9.

RoundedSwitcherCards + 3D SwitcherSource For RoundedSwitcherCards: “http://cydia.ianburns.co”
If you are not jailbroken then here’s How to Jailbreak your iPhone, iPad & iPad Touch