Verizon is rumored to be launching the CDMA version of HTC Desire HD on November 23rd, and name it HTC Incredible HD. This makes sense since Incredible was basically a Desire that was modified for Verizon's network.
It seems that HTC is going to bring a lot more 4.3" phones because they've been so successful for them. The bigger the screen the better it is for everything on your phone from apps and pictures to browser and videos. However, the phones can only become so big, and 4.3" seems like the perfect/maximum size for a smartphone.
As more 4.3" Android phones flood the market, I wouldn't be too surprised if Apple themselves decided to sell 2 versions of iPhone – one with 3.5" screen and that high pixel density and one with a 4.3" screen and lower pixel density (same resolution though).
The rumored specs for Incredible HD are a 4.3" display, 1 GHz Snapdragon (2nd gen), 768 RAM, 8 MP camera with dual-flash, front-facing camera and a kickstand.
Are you going to buy this phone considering Tegra 2 and other dual core phones will come to market soon after the holidays?