A pair of new reports suggest that Apple plans to hold a special media event on January 27, not Jan. 26 as had been rumored, at which it will likely introduce a possible beta version of iPhone OS 4.0 and an accompanying SDK. Citing multiple sources close to Apple, AllThingsD reports that the company is planning to hold a media event on Wednesday, January 27 at the Yerba Buena Center for the Arts in San Francisco, at which it will announce a major…