I haven’t found much regarding hub V3 functionality via forum searches. I thought maybe the 20% off sale on all Smartthings products (thru 4/9/16) could mean a v3 product on the rise? I know v2 came out in September 2015, but was just hoping.
On a positive note, for the last 3 months or so, I’ve had a fairly reliable system and feel the latest iOS app works well for me. Btw, I’m still on v1 with no plans to move to v2.