The first batch of BMW Z5 photos left something to be desired but thankfully our spy photographers have followed up with new pictures that show the car being tested during the day.

The first batch of BMW Z5 photos left something to be desired but thankfully our spy photographers have followed up with new pictures that show the car being tested during the day.

Set to replace the Z4, the Z5 is a sporty roadster that features a long hood, a wide grille, and sweptback headlights.  Moving further back, there's a rakish windscreen, aerodynamic mirrors, and a power retractable soft top. 

The rear end is heavily camouflaged but it features a relatively large trunk lid with what appears to be an integrated rear spoiler.  A closer inspection also reveals a dual exhaust system and a recessed license plate area.

While BMW and Toyota announced plans to jointly develop a sports car years ago, little is known about the upcoming model.  However, speculation has suggested it could use a carbon fiber tub similar to the i3 and i8.

Engine options are also unconfirmed but could be include a turbocharged 2.0-liter four-cylinder with outputs of 190 horsepower, 245 hp, and 270 hp. There's could also be a hybrid variant and a high-performance Z5 M with a turbocharged six-cylinder engine that produces approximately 425 hp.

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BMW Z5 spied up close