I wouldn't be surprised if there won't be an event. To fill an entire hour with a touch panel and a slightly thinner body is rather...difficult. And no rumors at all point towards anything else, that's in the pipeline.
I think they could. Even though I am as impatient as the next, when you actually look at the design films it is pretty impressive the design that goes into the products. Easy to forget. Recently watched the design film from the Macbook, pretty awesome.