1, 2). Our own source, who maintains contacts at Apple despite no longer working there, had previously noted the possibility.
Despite what may seem to be an endless string of iDevices with numeric naming schemes, both the iPhone 3G and 3GS were not numerically named (the 3G referred to 3G vs. EDGE, and the S implied speed, as did the S on the iPhone 4).
The HD makes a lot of sense as the prime focus of many thus far on the new iPad is the much touted iPad "retina display."
Apple's iPad event is scheduled for 10 a.m. PST on Wednesday, March 7. The company is also expected to discuss other products, but the focus will be on the iPad HD.