From day one of the test, if not used before, Honda have increased the length of their exhausts. I tried checking images from the German GP but could not find any close-up shots of the rear end and the normal pics of the RA108 did not seem to have this extra long length, so I'm pressuming that this is a new development.
The rear wing is also different from the one used in Germany, this is a low downforce design, compared to the more aggresively angled and shaped wing at Hockenheim.
Regarding the exhaust placement, why would they run the risk of placing the exhaust directly over the suspension components? And apparently their is no additional protection for them.