We've been reporting since last Summer that the 335i would be replaced by the 340i to coincide with the F30 3 Series LCI facelift and a possible changeover from the N55 engine to the new inline 6 turbo B58 engine.
And now the 340i has officially appeared on BMWUSA's official model production schedule for the 2016 model year. As the schedule indicates, production of the 340i begins in July-August 2015, with the Munich plant starting production in July and Rosslyn plant in August.
Its sibling, the F32 435i coupe will maintain its badge for the 2016 model year however, perhaps waiting until its LCI facelift to take on the 440i moniker (which
has appeared in BMW's systems since last Summer).
The 328i and 428i also retain their badges for the 2016 model year, but
our info shows that the 328i becomes the 330i in 2016 (for the U.S. 2017 model year) when it gets the new 4 cylinder turbo B48 engine to replace its current N20 engine.
For a look at the 340i LCI prototypes, see
http://www.bimmerpost.com/3-series/spyshots/