Rover

It's early days, but I prefer the new icon set. I am aware any change to well-used apps can be difficult to adjust to initially, so I think we need to give any change time, take a deep breath, and then see...
Working with the new versions will tell if anything has gone wrong rather than right... workflow matters (but so does the GUI, will spend a lot of time staring at it!).
To be honest, at this price point I think Serif has done a fantastic job, and will improve since they're going for volume sales and so keep the price down, and it's certainly a low price even for upgraders.
 
 
 
 
 
 

As shown in the comparison images, the old interface looked a bit outdated. The new interface seems to me much more sober and more visible. Of course, it requires a [short] learning curve.

+1 for hyperlinks support!
However, as a workaround PDF software can be used to add them in, as thomasbricker mentioned (I've done this successfully with Nuance Power PDF Advanced Pro 3).