Starbucks' new CEO just started the job. Here's what he could shake up, from the menu to the C-suite.

• Brian Niccol officially became Starbucks' CEO on Monday.
• The former Chipotle CEO is likely to bring big changes to the coffee chain, which is in need of a turnaround.
• Niccol's arrival could bring a C-suite shake-up and changes to Starbucks' menu, analysts said.

Brian Niccol is now the CEO of Starbucks. That means big changes could be on the way.