GT was early massproducing gravelbikes like their Grade. Specialized got the awesome Diverge which I totally love. Open released their Up that took bigger tires and they talked about 650b. Cannondale came with their Slate with 650b and Lefty.
Adventure bikes for people who wants to ride faster than a travelers bike like Specialized Awol or something like that. High end for all types of roads and with more roadgeometry compared to a cyclocross.
3T is the latest with their Aero Gravelbike called Exploro. Looks like a mix between Open and Cervelo in a way. Some techs here:
and a video that made me want to ride my Diverge on roads never seen before. Thinking of my friends Hagen and Martin and back to Dalsland Runt 😉
What do you think about it? Do you got or want a Gravelbike?
jonas wwBlog 
Den ser grym ut. Tror Gravel kommer att öka ordentligt. Det är så mycker roligare att svänga ut på en åker och köra grus än att harva på asfalt. Jag kör Treks Domane och Boone cross. Bägge tar en del skit 😉