User Graczdari from the GTAForums reported that pre-orders will not start "neither today nor this week." According to him, internal company emails indicate a Best Buy network error.
I don't want to disappoint anyone, but internal company emails say that Best Buy made a mistake and will not start taking pre-orders today. The situation may still change at the last minute, but I advise you to keep your expectations moderate.
This information was supported by forum administrator Spider-Vice. According to him, an employee of a European distribution company also stated that no pre-orders are currently planned.