Earlier Google unveiled Nexus Wireless Charger in U.S. and Canada at an initial price of $49.99 and now it is available (labeled as coming soon) in India at an initial price of INR 3,299 (~$53). Apart from India, Nexus Wireless Charger is also available in more countries including Australia, Japan and Korea.
According to Google Play Store,
No more messing with cords and plugs. With the Nexus Wireless Charger, your Nexus 7 (2013), Nexus 5, or Nexus 4 simply snaps into place on the magnetic face. Featuring a clean, compact design, the Nexus Wireless Charger adheres securely to a desk, nightstand, or countertop for grab-and-go charging
When compared with earlier version of Nexus Wireless Charger, newer version is flatter & smaller and you can easily snap your Nexus 7 (2013) tablet, Nexus 5 or Nexus 4 onto the face of new Nexus Wireless Charger. The compact Qi power cube ships with a 9-watt 1.8A AC adapter and a micro-USB cable. The Nexus Wireless Charger is compatible with new Nexus 7 (2013) tablet, Nexus 5 & Nexus 4 smartphone and it has dimensions 60x60x12.5mm & weighs 105 grams in weight.[Source] Google Play Store