http://www.stuff.co.nz/travel/international/7167236/London-to-Sydney-in-four-hours The photo is very cool!
Whilst the prospect is certainly intersting, I won't hold my breath. If it ever comes to pass I can't imagine it'll be until 2030 or even 2040 before we see it in active service.
Technically, it's not a photo. It's a concept rendering. And I see one of these articles every few years or so. When one gets flying, then I'll believe it.
With no windows it's hard to get an idea of the intended size. Engines remind me of the old Boeing SST.