With vivoactive 3.50 FW, on data screens, you can now select a 1,2, or 3 field layout! What this means, is if you coded a DF for the va, you may want to be ready for questions about how it looks odd in a one or two field layout. The simulator doesn't allow changing the # of df's right now, so no easy way to test if you don't have the actual device. This has been reported to Garmin.
When running a CIQ watch-app, it may fire up GPS even if the app doesn't request it, and keep it on the entire time the app runs (I've only seen this with watch-apps - not watch-faces or widgets) and it will drain the battery FAST. I've found if this happens, make sure that on the watch, in settings>Sensors, make sure GPS is "off". GPS will still be used when it's needed, but not when it wasn't. This has been reported to Garmin.