Brumbies have had fantastic retention and succession for a number of years, generally pulling in players who either add something or at the very least prove to be serviceable in the system. It's an area where most of the other AU Super Rugby clubs have struggled (esp. Melbourne and WA), in maintaining that mix of youth and experience and lossing players when there are options. Too many of the clubs have lost too much experience in big batches and had to go through a 'rebuilding' phase.
I tend to agree with
@Brumby Runner, it's the 10/12 axis which is the most interesting. I don't see a clear and proven 12 solution. I'm not entirely sure about Ollie Sapsford and CFS has always been one of those players who never seem to hit their potential. I'm also not sure how much 12 CFS has played across his career. I always recall him more on the wing or 13 so I wonder how he'd go with the shift to 12.
Noah also needs to evolve his game. The Brumbies play off 9 quite often. I'd like to see Noah step up a little more this year and play closer to the line. I'd also like to see his kicking game keep evolving, it's an area where AU continue to lag the countries up north and a aspect of the game we really don't utilise well enough.
I'm also interested this year to also see how Mogg goes. He was playing decently o/s before his return, but I'm not sure we've seen the best of him yet, be curious if he's able to push his case this year, but the whole Wright as fullback question does remain.
Like most years, the Brumbies will be there, or there about. It's just a question of them being able to push a little more to compete with the NZ teams who have so many players capable of imposing their individual brilliance on a game. Think your Ardie's, Barretts who both caused the Brumbies some woes last year.