A couple of years ago, Barclays announced that it was going to use vein scanners to help authenticate business customers looking to access their online accounts.  

http://www.bbc.co.uk/news/business-29062551

Similar scanning technology is now being trialled in a retail scenario in London as this article refers.

Given the number of solutions in the payments space, all focussing on various ways of streamlining the retail payment journey, this might/might not be the answer - we'll wait and see on that.  

What it and the media coverage of it does show is the continuing interest in looking for the best way to make frictionless payments in both the real and online worlds a reality, and the increasing focus in both the payments and security space on biometrics.