It turns out not even Sonic X Shadow Generation's developers knew Keanu Reeves would be in the movie-themed DLC
Briefly

Information on the movie was revealed to very few members even within Sega, so when we developed this content, we worked with very limited materials, which were provided by Paramount.
It was an incredibly secretive process, so when we started to implement the voice in the game, we actually weren't told who this voice is. The voice recording was handled by Iizuka-san in the US.
We actually haven't seen the final scenes in the movie yet, so we are excited to see how close our game ends up being to the movie!
We listened to the recorded voice files and felt, is this that actor...? so we were also surprised after the official announcement from Paramount!
Read at VG247
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