Just got an email from GameStop, and I just thought I'd share with you who haven't been able to pre-order.
"Due to overwhelming demand, we have recently stopped taking pre-orders for the Wii U. Don't worry, because we are now offering PowerUp Rewards members the opportunity to get on a wait list for the new Wii U system. Head to your local store now and talk to a Game Advisor to be added to the list. No deposit required!
While we can't guarantee when your system will be available, we'll send monthly updates to keep you informed of any Wii U developments.* So stay tuned and keep opening those emails. The next one could be your invitation to come pick one up!"
I am predicting that stores will get a few more units than they have pre-ordered. I'm guess Nintendo doesn't want 10,000,000 people preordering machines when they can only ship 2,000,000, which is why they only gave the stores a certain number to pre-sell. If you get on this waiting list right away, you may get a unit on launch day if they get extras, and if not, you'll have a much better shot at getting one when they get their second allotment. So if you missed out on pre-ordering, get on this list first thing tomorrow morning.