I agree that the focus of the game should be on Johto and everything within it, but having Kanto kind of remastered would be amazing as well.
Althoooooough, if Cinnabar Island turns out to be the volcanic bleh it was before, I won't be entirely disappointed. :P I mean, they might really want to make it EXACTLY like it's original version, just with futuristic edits (like how in FR/LG you had the VS Seeker, or whatever it's equivalent was.)
What I'd really like is yeah, the Safari Zone, but also A MEGA FOCUS on the day/night aspect. I mean sure in DPP the time changed and what not, but you didn't really see particular Pokémon out during certain time frames or catching Lapras on Fridays only (sigh..nostalgic.)
But for Kanto specifically, yeah, an improvement of gyms, a Safari Zone, a 2nd batch of Elite Four members to fight, and it'd be sweet to get another rival or have the Frontier.