The classic servers are progressing to tbc. If you want to play on classic era you can do that. Here is my post with all the information FROM BLIZZARD on the subject:
I am posting this for everyone to read the support article so you can see exactly how it works.
The beginning of this video explains it pretty well! Thanks Classic WoW Curios!
[13 Things You NEED to Do ASAP During Pre-Patch - Classic TBC Pre-Patch Guide]
I literally copy pasted it from the support page.
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