"Obviously, Sonic 1-4 will be there"
Will they though? We only know of Sonic 1 and 2, and 3 like never shows up these days, even on Sega licensed products and software. Sonic & Knuckles maybe. And sadly I don't think we're getting Shining Force II which is much better than the first.
But yeah, it'll be a better value than the SNES Mini for sure. Square must be really greedy with their licensing fees or Nintendo just wasn't willing to pay or make it a part of their vision for the SNES Mini. Because Chrono Trigger definitely should have been there. Mystical Ninja/Ganbare Goemon Yukihime Kyuushutsu Emaki was on the Japanese version but not on the others which is a strange decision imo. It was a great 2 player game