iOS 7.1 didn't bring a lot of new features the table, but the few tweaks and improvements it did add make iOS a lot more useable. Unfortunately, iOS 7.1 isn't jailbroken, but if you want to keep your jailbreak and still get the new features, you just need to track down a few tweaks.
Get The New Calendar
The Calendar in iOS 7.1 scored a few handy little improvements, including a better list view that makes it easier to read your upcoming plans and new holidays. It doesn't sound like much, but it really does make the iOS 7 calendar easier to use. Thankfully, jailbreakers can get the new calendar with Gregorian. You'll find it by searching for Gregorian in Cydia in Ryan Petrich's repository. You'll need to add that repository manually. Just head into Cydia, tap Manage > Sources, then Edit and add:
Speed Up Animations
Animations are a lot faster in iOS 7.1, which ,eams opening and closing apps, navigating between pages, and moving between folders is a lot less nausea-inducing than on iOS 7. Thankfully, you don't have to upgrade to get the improved speed. Speed Intensifier is a free tweak that allows you to set the speed of animations to your liking.
Tone Down The White
iOS 7.1 added a handy feature to tone down the whiteness so your phone doesn't blind you at night. While this isn't directly possible with a jailbroken phone, you can use F.lux to get a similar effect. Basically, once F.lux is installed, you can play around with different settings to change the colour temperature. With a little tweaking you can get a similar effect to the one available in iOS 7.1.
You can disable the parallax effect in iOS 7 pretty easily, but you lose the nifty animations when you do it. iOS 7.1 added a special configuration just for parallax, but you can easily get it on your jailbroken device too. Just download HiddenSettings7 and Parallax enaBlur. Once both are downloaded, you'll get an option to disable parallax on your home screen or your lock screen, just like in iOS 7.1.
Get The iOS 7.1 Icons
iOS 7.1 made a few very subtle changes to the icons that most people won't even notice, but if you want to keep things on the level, this Winterboard theme gives you the new icons for Phone, FaceTime and Messages.
Add The Automatic Flash Indicator
Another subtle change in iOS 7.1 is a new flash indicator for the camera. When your flash is about to go off, you'll know it based on the icon turning yellow. It's a little thing, but it's actually incredibly helpful for those times when you don't want to accidentally flash someone. Yellow Flash 7 adds a similar function to iOS 7.