According John Paczkowski over at All Things D, Apple is planning a "major product announcement" for Wednesday, January 27th -- not the 26th as we've heard in previous reports. Additionally, the French site Mac4Ever says developers have been given a beta of the iPhone OS 4 SDK which includes a "simulator" for reformatting / scaling applications to a new, tablet-sized screens. Here at Engadget, we can confirm that sources very familiar with the situation over in Cupertino have been given info about a tablet heading for launch at the end of January, which will -- in fact -- require reformatting and resizing for (we assume) yep, its new screen s