Its no secret the 2.4 GHz space is overwhelmed with WiFi and Non WiFi devices. The new B3000 still only supports 2.4 GHz, which is a bit disappointing. Although, it is mentioned the badge is more robust, which I think anyone in Healthcare can appreciate. Vocera badges in most healthcare environments last 12-24 months TOPs.
From: Vocera
Vocera Communications, Inc., today announced the commercial introduction of the new Vocera B3000 Communication Badge featuring enhanced durability, audio quality, and speech recognition. The B3000 is 
the fourth generation of the Vocera Communication Badge, which currently is used in more than 750 hospitals and other healthcare facilities worldwide to improve patient safety and satisfaction, and increase hospital efficiency and productivity.
With a highly durable design, including a magnesium alloy spine, the B3000 Badge is designed to withstand the rigors of the workplace without sacrificing size, weight and wearability. The B3000 features four microphones and integrated acoustic noise reduction to deliver instant high-quality communication with optimal audio. This technology reduces background noise found in many emergency rooms and trauma centers, resulting in clearer conversations and improved speech recognition in high noise environments.
You can get specs and additional reading below: