I like Mongoose...
but to be honest, as a life long fan and Arthuriana expert, I believe that the Greg Stafford and the others at Chaosium/Green Knight/Arthaus have pretty much locked it down to as good as its ever gonna be. The nostalgia of the first ed, the book format of the second, the sheer volume of further editions, culminating in the succintness of the latest...
I honestly think we've seen Pendragon in all its possible best light.
Mongoose would just make Pendragon into a rather pale MRQ shadow of its former selves...
no offence meant but there has been so much devotion and care put into previous volumes that i honestly dont think Mongoose can better them.