A number of new Pokemon have been revealed prior to the launch of Pokemon Sword and Shield, but not quite as many as we've seen with previous new installments. According to a Famitsu interview with Pokemon Co., this was intentional. See their reasoning behind the decision in their statement below.
So as you mentioned, yes, I can confirm it’s intentional that we revealed fewer new Pokemon before the launch of Pokemon Sword and Shield. The reason is because we want everyone to play and encounter new Pokemon by themselves in the games. As these titles have the same essence of what makes Pokemon fun, we hope you will look forward and enjoy.