Update 1: Confirmation of iOS 4.3 build 85F148b has been confirmed via another screenshot sent to RedmondPie:
BGR has received confirmation from a source that iOS 4.3 will be coming in March. Carrier support will be required for this feature. Personal Hotspot will allow up to five devices to connect for data sharing. The extra information BGR’s source includes is that iOS 4.3 will be version 85F148b, and will include baseband 04.08.00, and technical assistance planned for March. Other sites such as iPhoneClub and iPhoneHellas received info that iOS 4.3 will bring Personal Hotspot as well.
Apple’s iOS version history has never included a x.3. It looks like 4.3 will change this.
Here in Canada we are happy that Rogers, Telus and Bell currently support iPhone data tethering at no extra cost. Users in the US aren’t so lucky as AT&T charges an extra $20/month. Will the ‘Big 3’ support Personal Hotspot when it is released with iOS 4.3? I guess the bigger question is–how much will they try to charge us for it? 😉