With less than four hours to go until Apple's iPhone event, the Apple Store is down and is greeting visitors with its "We'll be back" sign. We expect that the site will remain down until Apple's keynote has ended.

Apple is expected to launch two new iPhones at an event tonight, which will kick off at 6pm here in the UK. It's being held at Apple's Town Hall in Cupertino, California. You can tune in to our live feed for up-to-the-minute news from the event. We'll also be bringing you UK pricing and release dates, as well as expert opinions on the new products.

Here's what we expect to see when the Apple Store returns later today:

iPhone 5S

The iPhone 5S could be available in four colours including black, white, gold and graphite. We also expect it to feature an A7 chip and a fingerprint sensor.

Check out our roundup for more iPhone 5S rumours and leaked images and our iPhone 5S release date story and our iPhone 5S preview

iPhone 5C

Apple is also expected to launch a cheaper iPhone model, dubbed iPhone 5C. It is thought that it will have a plastic shell and could be available in multiple colour options..

Check out our roundup for more iPhone 5C rumours and our iPhone 5C preview.  

iOS 7

We expect the roll out of the new mobile operating system will closely follow the unveiling of the new iPhones. Don't expect it to be available for download on 10 September, though. We expect a delay of around a week before the software is pushed out to iPhones and iPads.

Read our iOS 7 for iPhone & iPad preview

Apple TV

We've heard that there might be a new model of the Apple TV in the pipeline. We doubt that there will be a major hardware update - and definitely don't expect to see an actual TV - but we do expect that Apple will have something to announced with regards the Apple TV software.

Mac Pro

The new Mac Pro may get a mention. With the Intel Developers Forum taking place at the same time in San Francisco it seems likely that some people will be talking about the processor being used in the Mac Pro, we doubt Apple would want anyone else to steal its thunder. However, we're not sure that Apple would want the Mac Pro news buried by the iPhone.

Read about when the new Mac Pro will launch and what pro Mac users want from the new Mac Pro

Mac OS X Mavericks

We expect that Apple will role out OS X Mavericks soon, but according to reports it might not coincide with the launch of the new iPhones. We could be treated to some further information about the release date of the new operating system, though.

Read our OS X Mavericks preview 

See also:

All eyes on the iPhone 5C today

Apple decorates iPhone event venue with colourful banners

Get your Mac ready for OS X Mavericks

Black iPhone 5S and blue iPhone 5C most popular choice among potential customers

Queuers camp outside Apple Store for iPhone 5S, iPhone 5C, before they're even unveiled