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'Latest production version' of Porsche 918 shown off on Twitter

Porsche posted a picture of what it is calling "the latest production version" of the 2015 Porsche 918 Spyder on Twitter. It looks like the gasoline-hybrid supercar is being driven sportively on some California back roads during Monterey Speed Week.
Whatever updates were made to this version aren't visual (except for the paint), as the one Chris Harris drove last spring and another seen hot-weather testing in Nevada both had production bodies. We presume the changes are relatively minor and more than skin deep - perhaps brake calibration, suspension tuning or tweaks to the powertrain - but Porsche didn't release any more information.
The 918 Spyder is Porsche's latest supercar, which will compete with the LaFerrari and the McLaren P1 hybrid supercars. The Porsche may be the underdog of the group when considering horsepower, acceleration, top speed and price, but the 887-horsepower brute has the most advanced hybrid drivetrain of the three.

New Porsche 4-cyl engines to range from 1.6L to 2.5L

Recent rumors of a turbocharged, flat-four-engine from Porsche for the Boxster (pictured testing above), Cayman and maybe other models go back over a year. The latest scuttlebutt indicates that there could be three variants on the horizon with 1.6-, 2.0- and 2.5-liter displacements and power as high as 360 horsepower.
Car magazine in the UK claims to have access to the specifications for the project and thinks the 2.0- and 2.5-liter versions are guaranteed for production for the Boxster and Cayman. However, it believes a question mark still looms over the 210-hp 1.6L because the engine would go into a new, smaller sports car that still doesn't have a green light for production.
Regardless of displacement, the new fours would be turbocharged and direct-injected. The 2.0-liter would produce around 286 hp and 295 pound-feet of torque, and the 2.5-liter would make about 360 hp and 347 lb-ft. Earlier reports pegged some parts sharing with the current flat-six.

All Porsche 911s to get turbos in 2015?

Currently, Porsche builds two turbocharged 911s - the Turbo and the Turbo S (and their cabriolet counterparts). The rest of the 911 range, meanwhile, is motivated by either 3.4- or 3.8-liter flat-sixes of varying outputs. This clear separation could be set to change in the very near future, though, as rumors continue to swirl that Porsche's rear-engined range could switch exclusively to turbocharged power.
This time, it's Car projecting that the 911 range will go turbocharged as part of a mid-cycle refresh, with the base Carrera's 3.4-liter dropping to 2.9 liters and adding an iron lung, bumping the entry level 911 up to 400 horsepower. Yes, a 400-horsepower, entry level 911. The Carrera S, meanwhile, will retain its 3.8-liter engine, but will also benefit from turbocharging, increasing output to 530 horsepower and 520 pound-feet of torque. So basically, it sounds like the current, 520-hp 911 Turbo will become the next Carrera S.
What does that mean for Porsche's traditional high-performance models? Well, it's a safe bet that the Turbo, Turbo S and eventual GT2 will be producing seriously huge power figures. Based on pure speculation, we wouldn't be shocked to see a 600-hp Turbo, with the S and GT2 increasing output markedly from there.