It's by no means a new rumour—having been suggested by French site Nowhereelse.fr, Reuters, and the WSJ before. But clearly the Journal is confident that the iPhone 5S will feature the technology. Rumours of a new, silver ring surrounding the iPhone's iconic button neatly complement the speculation, too.
While fingerprint scanning has failed to really take off in the past, if Apple can make the concept work it could be pretty amazing. Essentially you could forget lockscreen passwords, instead relying on the phone to recognise your finger as you tap its button. Let's wait and see what comes of the launch later today. [Wall Street Journal>]