In a post on Kickstarter, Inxile has outlined a few details with regards to the length and features coming in Wasteland 2.
For starters, the studio are estimating that a straight-forward run at the campaign will take around 50 hours. "Though it'll take quite a bit longer if you're looking to fully explore every location and mission," they hastened to add.
The studio are also intensifying their work on Los Angeles ("as we're finishing up more Arizona areas") and as you can see from the screens below, it's shaping up quite nicely; "With most of the human presence wiped out by the war, the creation of small and mostly toxic lakes of water by the post-war storms, and the shifting of air and water currents, the Los Angeles of Wasteland 2 is a lush area. Nature has reclaimed much of the ruined cityscape."
The next update, which will include the first Linux build of the anticipated RPG, will also bring with it the usual medley of tweaks and improvements. More details here if you want them.