Apple’s upcoming wearable device, based on iOS, will run third-party applications and, furthermore, may come equipped with an App Store, according to two sources with knowledge of the new device. It is currently unclear if the App Store will be full-fledged, like on the iPhone and iPad, or if it will be a special section with in the iPhone App Store for apps that play nicely with the new wearable device.

A small handful of high-profile social network and services companies with apps on the iPhone and iPad App Store have already been seeded with a pre-release version of the Apple SDK (Software Development Kit) for wearables under strict non-disclosure agreements. One of the developers with access to the pre-release SDK is Facebook, according to a source. Facebook is also said to be finishing up work on an iOS 8-optimized version of its iPhone app with improved notifications. The social network is also experimenting with ways it can leverage the new Notification Center widget APIs.

The SDK was seeded “very recently” to these developers, and Apple likely wants to demonstrate some third-party wearable apps at Tuesday’s event, according to one source. Apple, in the past, has provided select developers with early versions of SDKs in order to boast new apps on the keynote stage. For example, several apps from companies like AOL were shown off with the first public demonstration of the iPhone SDK, fancy gaming and drawing apps were demonstrated alongside the first iPad in 2010, and the iPhone 4S’s dual-core A5 chip was launched alongside a graphics-intense video game…

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