WMG / Toontown Online

The Chairman is an upcoming boss.
Think of it. The CEO said “The Chairman won’t be happy about this!” and he was saying it like The Chairman was his boss, meaning there are more bosses to come in the game.

Nothing will be behind the “Coming Soon” sign in the Chip & Dale’s Acorn Acres tunnel.
Confirmed. The game is closed. But in ToonTown Rewritten It leads to the Toonfest area or any upcoming big event area

Toontown did not get shut down.

It along with Pixie Hollow where just swallowed by the darkness.

Either that or...

Toontown is canon in Kingdom Hearts.

It is the entire world of Disney Town and will maybe see an appearance in 0.2 or KH 3.