I guess by NEW FAST COURSE they will be utilising the newish (Last couple of years or so) path that runs inside the park parallel to the Kenilworth Road, rather than heading out of the park onto the Kenilworth road and back into the park via the main gates, which was a bit twisty.
Apart from the new bit (which is flat) the outer loop of the memorial park is gently undulating to slightly hilly, not entirely paved (But the off road section is hard enough in the summer not to slow) and is pretty quick if you like running on slightly undulating paths (it is by no means pancake flat). The good guys run some pretty impressive times there so it can definitely be considered a pb course, I think.
I've not raced there for a couple of years but plan to this time around, and will probably do the 10 mile race on Sunday in Leicestershire. Not entirely sure I'll recover in a day but I'm keen to do at least one 10 miler and one five miler this year.