The logo is hardly going to be confused with Bluetooth (which handily has its own recognisable symbol) - BT is ubiquitous, pretty much any logo they could have come up with would be easily identified as BT.
As it is, it has a link with the original British Telecom symbol, whilst retaining the circular shape of the last logo (ensuring a smooth changeover of badges on their physical products, for example). It's modern, and the execution up this page seems good (and doesn't dispense with the purple they've used on a regular basis).