Next Sonic has a project name of "Sonic Propel"(PS360, Wii U, 3DS). Take with a grain of salt.

[Marucha]

- Slower to allow for better movement

You got that from this line:

より多くの微調整をより正確に配給するための低速の動きと、世代力学を使用

Says Utilizing "Generation mechanics"...

Since it didn't say Sonic Generations specifically, I'm going to assume it's about the game mechanics since it goes on to talk about distribution.