I noticed an article in Business Life magazine, which mentioned that electronic luggage tags would be available from January. I remember reading about this some time ago, but nothing ever materialised, so I just assumed that it was shelved.

There is a photo in the article and they look quite good. Apparently it connects to your app and you update it from there when you check in online. There is a snag however... they will be priced at £60 a piece, though I have to say, I am tempted.