I think we're more likely to see an iPod+ than an iPad Mini, personally. The iTouch line didn't have a spec bump at all last year, so maybe it's on its way out, replaced by a ~5.5" iPod+ at one end, and a new touchscreen iPod Mini at the other?
Either way, I don't see a place for a ~7.8" iPad, though as always, happy to be proven wrong