Update 1.5 for Minecraft is now available to download in pre-release form with a full release set for next week.

You can download the pre-release for 1.5, dubbed the Redstone Update, here. The release is scheduled for March 13 and some of the new additions can be found below:

• Added Redstone Comparator (used in Redstone logic)
• Added Hopper (collects items and moves them to containers)
• Added Dropper (similar to Dispensers, but always drops the item)
• Added Activator Rail (activates TNT Minecarts)
• Added Daylight Sensor
• Added Trapped Chest
• Added Weighed Pressure Plate
• Added Block of Redstone
• Added Nether Brick (item)
• Added Nether Quartz and ore
• Added Block of Quartz, with half blocks and chiseled variants