This year Qualcomm produces the 1.3 ghz snapdragon which is 30% more powerful AND uses 30% less battery than the 1 ghz version. I think that will be the next processor. 1800 mAh capacity is heavy. 4.5 inch screen could be but the device should not be bigger than the HD2. LTE is too early I think.
1 GB ram and rom, 8 megpixel camera, HDMI, USB 2.0 is plausible.