PokÁ©mon GO Blog:

From encountering and catching your first PokÁ©mon to assembling a powerful team to take on a Legendary PokÁ©mon in Raid Battles, you have certainly built incredible skills as a Trainer over the last two years. Are you ready for the next big challenge? Show off your skills against others with Trainer Battles, coming soon to PokÁ©mon GO!

I know a lot of people who are going to be very, very excited about this.