The Apple Store is down this morning, with the usual "We'll be back" greeting customers attempting to buy something from the store. It's believed that the store has been offline since around 5am GMT. UPDATE: The Apple Store is back online, and appears to have had a bit of a redesign. We'll bring you more details soon.

Apple says it's "busy updating the Apple Store for you and will be back soon," so we're placing our bets on what might be in the pipeline.

Apple's WWDC is coming up, - is set to kick off on 10 June - so we expect that the company is busy preparing for its keynote at the event. Apple has said that we will be learning about the future of iOS and OS X at the keynote, so perhaps today's Apple Store update will reveal some more information about iOS 7 or Mac OS X 10.9. SEE: What to expect from Apple at WWDC 2013

The Mac Pro is due for an update, so we could see a new model on the store later today when it comes back online. Also, it's believed that we could see a new MacBook Air and MacBook Pro lineup within the next few weeks, which could also be the reason for the Apple Store's downtime.

We don't think we'll be getting any new iPads or iPhones until autumn, so it's unlikely that the Apple Store is down in order to share information about those products.

Perhaps Apple will be releasing new iLife or iWork for Mac, as these software products are long due an update.

Alternatively, one theory is that Apple could be planning to unveil its own games console today. Microsoft revealed its Xbox One yesterday, following a Sony PS4 announcement in February, reigniting Sony vs Microsoft game console wars. Does Apple want in?

Of course, Apple could just be carrying out routine maintenance…

We'll keep you updated as soon as we find out more. What do you think (or hope) Apple's working on behind the scenes during its Apple Store downtime today? Let us know in the comments below or on Twitter.

See also:

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Apple iWatch release date, rumours and leaked images

Should I buy an iPad mini or an iPad 4?

Apple's TV strategy: blocking approval of new TV tuners?