Curiosa is a Cydia Tweak which will give you push notifications for Cydia package updates. Every single Tweak, Theme, or any other package will send you a notification when there is an update available. The notifications work the same as any other, slide the icon and it will take you to the update page for that package. You can set the refresh rate in the settings so your device only check periodically. Either that or you can set an Activator action to refresh Cydia for you. Curiosa can be found for FREE under the Ryan Petrich Repo below.