Probably the biggest addition to Wear 2.0 is the ability for apps to communicate directly over the Internet via Bluetooth, Wi-Fi, or (for the few watches that have it) cellular, rather than relying exclusively on a tethered phone or cloud syncing between your watch and your phone for communication.
An API for complications
hird parties have been able to make Android Wear watch faces for some time now, but the kind of information they can display is heavily dependent on the watch face itself—even with lots of options, it might be hard to find one that looks good and gives you the glance-able information you want. Wear 2.0 introduces a full-fledged API for complications, those little snippets of extra information on dumb watches (or on the Apple Watch, for that matter) that show you things like the current date or moon phases.
A dinky keyboard and handwriting recognition
ou can already kind-of-sort-of use your watch for texting and Hangouts and other communications now, but you mostly have to rely on sometimes-flaky voice dictation features and short, canned quick replies. Wear 2.0 adds two new input methods: a tiny little swipe-style keyboard that you can use to type and a handwriting recognition mode that lets you sketch out letters on your watch’s screen to spell out messages.
Google Fit additions
inally, Wear 2.0 makes a handful of Google Fit-related improvements intended to make Wear watches better fitness trackers. Some of these are really only of interest to developers—watch apps can automatically be notified and updated when Fit data changes, rather than having to query for updates constantly. But apps will also be able to detect when users begin walking, running, or biking, and they can use that information to automatically open the appropriate apps.