The second-generation iPad will have both front- and rear-facing cameras, among several other improvements, according to a new report. Citing four people familiar with the situation, Reuters reports that touchscreen chip designer Wintek, battery maker Simplo Technology, and cover maker AVY Precision are all ramping up for a new round of production in the first quarter of 2011, with two sources claiming the ramp-up is for the second-generation iPad.…