New spy photos of the next-generation Lexus IS today, by way of Autoblog.it:
Much like the photos of the GS mule in 2010, this mule looks like a standard IS with a slightly wider stance — perhaps even with some adjustments to the wheelbase.
Beyond that, I don’t really see any other obvious changes — did I miss anything?
Update: Edited for clarity.
Update two: Just in case there’s any confusion about what a “mule” is, TLE commenter wasapasserby defined it as “a testbed for future mechanical components, often having a heavily altered current production exterior”.