The announcement, as seen in the media including the BBC website, refers to Europe's largest free WiFi network being set up in the boroughs of Westminster and Kensington and Chelsea. So it's aimed at tourists rather than anyone actually doing anything connected with the Games, in spite of the apparent link.
Not everyone reading this news blog is a Londoner of course, and not everyone will be familiar with the topology of the capital. So just to clarify, Kensington and Chelsea (one borough) is pretty West of central - Kensington is in W8, for example. Westminster is mostly in W1.
The Olympic village is in E20, a new postcode created in its honour. The "E" stands - of course - for "East". You'll notice that both of the boroughs in the free WiFi catchment areas are in the West, albeit only marginally so in the case of Westminster which is as central as it gets.