Was somewhat optimistic for at least the first evolutions to be revealed, but oh well.
If anything, I'd suggest Marill perhaps?Pichu and Togepi were Pokémon of their time though. They're not enduring pop culture icons like Pikachu is, or to a lesser extent Eevee. If they make Johto versions of Let's Go! (which I find doubtful, since Pokémon GO playership dropped off before Niantic could add in Generation II), it'd likely star Pikachu again and maybe someone else.