Barnes & Noble's special Nook-related event next week may result in a color e-reader, a source mentioned this afternoon. To be called just the Nook Color, it would have a seven-inch touchscreen as its main interface, presumably in place of the split e-paper and LCDs it uses today. The contact for CNET isn't certain of the technology, though it's more likely to be LCD with mirasol displays not due to formally launch until early 2011.