Is it possible to iOS 8.1 Cydia download
Apple released iOS 8.1 yesterday with many bug fixes and new features. But still you can’t have Cydia download on any iPhone or iPad running iOS 8.1 because there is no proper iOS 8.1 jailbreak tool. You can only do iOS 8.1 Cydia download through jailbreak. Please refer our Cydia download introduction if you are not aware about what is Cydia and How to download Cydia on iOS 8.1 or any other iOS version.
The new iOS 8.1 supported on iPhone 6 plus, 6, 5S, 5C, 5, 4S, iPad Air, Air 2, mini retina, mini, mini 3, 4, 3, 2 and bundled with new features such as Apple pay, iCloud photo library beta, Enabled messaging on iPad and iMac, Added passbook passes on Airdrop and enabled switching between 2G, 3G, 4G and LTE networks manually and fixed many errors.
iOS 8.1 Cydia download eligibility
You can upgrade to iOS 8.1 at Settings > General > Software update If you still using iOS 7.X.X on your device. But the upgrade will remove your Current Cydia if you have already jailbroken and you will lose Cydia download eligibility. But there is no hassle of upgrade if you are already in iOS 8.X.X.
Most probably iOS 8.1 jailbreak will release soon if there’s any possibility because the iOS 8.1 seems to be more stable and reliable than previous iOS 8 updates.