Since the copy has been completed prior to release Yes

Edit: This article was sourced from Blizz. On the day of patching, you'll be able to open Battle.net desktop and choose the game you want to play: WoW Classic or Burning Crusade Classic. Both games will show your characters that WOW TBC Classic Gold are currently playing with the old name/s of the realm. When you have chosen a game choose a character that you would like to play and then confirm. You may also use an optional paid service to play the cloned character in the two game types if you choose to play as your character on both. All you need to do is sign in the game as usual and begin playing.

Since the copy has been completed prior to release Yes. Classic includes all characters, therefore there is no delay in copying if you select Classic. TBC can cause delays, simply because it's not immediate. It can cause more characters being copied simultaneously. This could result in the system being unable to function properly.

Bots will likely benefit from the boost, which makes it more difficult for bots. If bots were controlled and the boost was controlled, it would not be an issue. My family and I go back to classic because we enjoy the tbc. They join only because they have the ability to increase their levels beyond the vanilla levelling content.

Our characters are already in Classic. They don't want to sit inactive while others visit TBC. Every character will have their names copied prior to the launch. TBC will change the "active bit" on the TBC database to true, and the Classic bit to buy WOW Classic TBC Gold false if you select TBC. Then, you can pay $35 to get the Classic bit reversed.