Sony adverts running in the Metro today confirms that the PS4 will definitely launch in 2013 in the UK (and Europe, we can assume). Here's the ad, taken from the PDF version of the paper:

When the PS4 was announced in February Sony would not confirm that the "Holiday 2013" date given applied to the whole world - historically, there's been a delay between Playstation launches in Japan, the US and Europe. But at least in the UK, it looks like we'll have it in time for Christmas. Hurrah!

Keza MacDonald is in charge of IGN's games coverage in the UK. You can follow her on IGN and Twitter