Most people agree that 4 inches seems to be the sweet spot for phone displays, but there is definitely a trend in the 4.3-inch form factor. I originally thought it would be too large as well, but I am quite happy with the extra real estate on my Droid X. Motorola and HTC already have phones with 4.3-inch displays and LG is looking to join in on the party.
Leaked images show a new device codenamed the Optimus Big. Other then the 4.3-inch screen, it sports a 1GHz processor, a T-DMB TV tuner, a front facing camera, and LG’s super bright NOVA Display. We have no idea what version of Android is running on it. It is expected to be launching in Korea next month and I highly doubt it will make it to the US.