2015 VW Jetta Gets Official Just Ahead of NYC Reveal

One of the biggest tweaks is the new, 2.0-liter TDI engine, which is now more efficient, returning 45 miles per gallon on the freeway (compared to 42 mpg on the 2014 model) while retaining the previous engine's 236 pound-feet of torque.

Normally, we'd run through visual changes first, but really, the tweaks made are so minor that only the staunchest of VW enthusiast is going to notice them. The new, optional xenon headlights and their 15 LED running lights are the most obvious changes, while the LED taillights of the GLI and Hybrid should stick out a bit. VW's primary focus, it seems, was on the exterior's aerodynamics, rather than aesthetics.

The trunklid is slightly more aerodynamic, as is the front fascia and the rain gutters along the A-pillars. Sill covers, wheel spoilers and an underbody panel on the rear axle are less noticeable aero tweaks. Both the Jetta 1.8T and TDI include an active grille shutter on the radiator, to further reduce drag at speed.

Volkswagen has made some mild tweaks to the interior, with a color multi-function display and some new chrome trim on "mid and high-level trims." The big changes on the interior are the wealth of new driver assistance features. Blind spot monitoring comes to the Jetta, along with cross-traffic alert and frontal collision warning. It's unclear if these will be options or part of a pre-determined package or trim level.