It was announced a few days ago that the Sightstone item would be removed from the store, but players will still be able to use its warding power. The active effect is being moved to the fully-upgraded versions of the support items, but that does mean that those items will lose their current effects.
However, the active effect of Face of the Mountain will not be coming back as a new item, at least not the in the way that it exists now. Riot Meddler addressed that point in others in a recent Gameplay Thoughts post where the designer listed several important Sightstone-related points to take note of.
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