Baseball will be different next season. Here's an article on mlb.com that breaks it down. The three big changes will be a pitch clock, a ban on shifts, and larger bases.
The pitch clock is a fundamental change. Baseball has always been a "timeless" sport and the introduction of a timer is unfortunate. I've always felt that the best way to improve pace-of-play was to give the umpires the authority to enforce the rules. Alas, people don't pay to see the umpires. They want to see their heroes and if their hero has to step out of the box and adjust his velcro straps after every pitch than so be it.