Glass Pane

Glass Panes are a forthcoming block that were announced by Jeb in a tweet that will be released in 1.8. They can currently be used in-game through the preview release. They have a similar placement behaviour as Redstone, Iron Bars, and Fences and 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.

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