It’s assumed that both follow-up seasons will retain the same 24-episode orders that the show has been earning since Season 4, though we do know that Season 11 and Season 12 will debut in Fall 2017 and Fall 2018, respectively.
Not much mystery was there, but facts are facts.
Since this is just the earliest of announcements, CBS didn’t share a whole lot of insight into what the next two seasons of The Big Bang Theory will have to offer, although we have about a million guesses, and half of them end in “Sheldon says something that makes people feel uncomfortable for a few seconds.”