Tech pundit Bob Cringley's annual predictions are always a good read. Here are his wireless predictions:

->WiMax will be a huge story by summer, but widespread adoption of the wireless networking technology will take at least another two years. In the meantime, though, nobody will make money on WiFi, but it will become ubiquitous anyway, especially with the arrival of 802.11n.
( I'm not sure WiMAX can be much more of a "huge" story than it is already. I would add that Wi-Fi will become known more for the applications it supports [see below] than for simply providing Internet access.)

-> VoIP will continue to shatter the telephone industry with the arrival of WiFi phones, which might finally be the killer app for hotspots. Eventually, all the backbone suppliers will figure out that VoIP is their salvation and will either start their own VoIP companies or ally with big VoIP players.
(I agree. Wi-Fi phones [standalone or embedded within PDAs and cellular handsets] are going to give carriers a reason to invest in hotspots; they're a lot cheaper than base stations and can often be partially supported by the venue.)

-> Two thousand five will NOT be the year for UltraWide Band (UWB) networking or Power Line Networking, but both will do really well in 2006.
(After spending time at CES, it's safe to say we'll see commercial UWB products, primarily for wireless USB. However, we will also see a blending of power line and UWB technology for pretty nifty hi-def home networking. But much of this will take until 2006 I'm afraid.)

You can read Bob's full list of predictions here.