Waiting for some activity of significance, below is a news blip, but it mostly vaporware. Only thing to really follow is Zigbee going to Thread. Thread is IP based which is nice, but you cant buy anything right now.
http://www.businesswire.com/news/ho...-Connected-Home-Products-Powered-Silicon-Labs
http://www.businesswire.com/news/ho...-Connected-Home-Products-Powered-Silicon-Labs