Glass Pane

Glass Panes are a forthcoming block which were announced by Jeb in a tweet. They will be released in 1.8. They can currently be used in-game through the preview release. Their placement behaviour is similar to Redstone, Iron Bars, and Fences. They have the same texture as Glass. They cannot currently be placed horizontally. Glass Panes can be mined and picked up without being broken. (about 1:45 min) Glass panes are present in buildings of villages. When placed without anything on the sides of it it will appear in the shape of a X but hen something is placed on the sides of it it will become flat or into a V shape or a T shape depending on the items surrounding it.

Crafting
Glass Panes can be crafted by placing 6 Glass blocks in a rectangle. Tutorial