Rui Carmo
Like I wrote two years or so ago, believing anything other than Tim Cook being not just more than perfectly capable of keeping things running (as he already, demonstrably, did) but also pushing things even further would be doing him a disservice.
Steve will stay on as Chairman, and of course wild rumors will start crawling out of the woodwork in 3, 2, 1… Ah well. All the best, Steve.