The iPad 3 supports Bluetooth 4.0 which includes support for Bluetooth Low Energy (BLE). This offers considerable energy savings compared to older technology. Does anyone know about existing or upcoming keyboards using this technology? The only reference to BLE and keyboards I could find is this article from Nordic Semi, promising up to a years performance out of 2 AA batteries, but no actual products are being demonstrated. It does specifically mention 2012 Q1 availability for the chip though.