The Mini Driver which TaylorMade offered in SLDR and AeroBurner models was a very cool product. It nicely bridged the gap between a driver and fairway wood. For a lot of players that was a perfect fit as the added loft and shorter shaft of the Mini gave them exactly what they needed.
In addition a Crown Step design lowers the CG allowing for improved launch characteristics. The Z F85 comes standard with a Project X HZRDUS Red 65 shaft and is available in 13.5° 15° and 18°.
Replacing the previous Z 565 model is the new Z 585 which is designed to produce a higher straighter ball flight than the Z 785 with more forgiveness on strikes away from the enter of the clubface.
The Z 785 driver is revolutionary for Srixon for a number of reasons but mostly because it produces up to 3 mph more ball speed than the previous model yielding up to ten more yards of total distance. The key to the impressive improvement is a new Ti51AF Cup Face which is lighter and significantly stronger allowing it to be made 10% thinner for more COR and ball speed at impact.
However I’d say it’s unlikely that a new iteration of the Mini is coming any time soon. Modern fairway wood designs like TaylorMade’s M3 and M4 for example are so good and so long that former Mini players can simply find the right fit and most likely get the same or even better performance.