I loved weathergraph. Was my favourite watch face on my pebble and garmin, until my eyes got too old and I couldn't read the smaller text anymore. Now I use a watch face for older guys like me, but miss the graph.
I loved my pebble. Closest I've found is the Garmin platform, with a MIP display. My Fenix 5x works pretty well, and there are certainly apps available for it too.
Pebble was something special though, so I'll be looking forward to what comes of this.