EDIT: This post was sourced from Blizz. "On Patch day, players will be able open the Battle.net desktop application and select the game you wish to play--Burning Crusade Classic or WoW Classic. Both types of
WOW Classic TBC Gold games will display your characters that are currently playing under the old realm's name/s. Once you've chosen a game to play, you'll pick the character you want to play, and then confirm your selection. If you decide to play your character in both game types it is possible to use an optional paid service to gain access to the cloned character in both games. All you need to do is sign in the same way you normally do and play."
Because the copy is completed prior to release and is released. Classic contains all the characters, which means there's no delay for copying when you select Classic. If you select TBC and the copy is made, it could create downtime (just because it's not instantaneous) and imagine a number of people's characters being copied at once which could slow the system down.
Bots are likely to utilize the boost, making it more difficult for bots. However, if bots were properly taken care of I'm not sure that the boost would be much of an issue. My family and I prefer classic since we like TBC. They join only because they have the ability to increase their levels beyond the vanilla content.
Our characters are in Classic. They definitely don't want to waste time for people going to TBC. Every character will have their names copied prior the time of launch. TBC will change the "active bit" on the TBC database to true, and
buy WOW TBC Classic Gold the Classic bit to false if you select TBC. Then you pay $35 to get the Classic bit reversed.
EDIT: This post was sourced from Blizz. "On Patch day, players will be able open the Battle.net desktop application and select the game you wish to play--Burning Crusade Classic or WoW Classic. Both types of WOW Classic TBC Gold games will display your characters that are currently playing under the old realm's name/s. Once you've chosen a game to play, you'll pick the character you want to play, and then confirm your selection. If you decide to play your character in both game types it is possible to use an optional paid service to gain access to the cloned character in both games. All you need to do is sign in the same way you normally do and play."
