The information we have comes from one of the UK’s largest electrical retailers, with a member of their management team saying:
Do not take on any pre-orders on the ipad 2 as we will not be ordering any more
The reason for the company not ordering any more will most likely be in preparation for when the iPad 3 is released to make sure they do not have any redundant stock left over.
Baring in mind this is from a company based in the UK, it is likely that stores across the US would have already done this as the UK and Europe usually gets a slightly later release date, indicating that we could see the iPad 3 release date as early as January/February 2012!
Keep checking the website for more updates and the leaks begin to come out.