HTC won’t be making a large-screened Windows Phone anytime soon. The reason for this? The platform’s limitations. This, in fact, has always been the reason why certain shiny new hardware advancements haven’t made it to the WP camp, or if they have (see HD displays and dual-core processors), they’ve been pretty late compared to the Android competition.
If Microsoft wants to compete with Android as a viable alternative to manufacturers using Android, it better get working on this. There is a market for behemoth smartphones, and even if it is a small market, they need anything they can get.