If you're completely happy with what you have now, then wait, but the redesign is supposed to be in 2012, not late 2011, so you would likely be waiting another year.
If you are positive that you want the redesign when it comes out, then I would buy a refurb from Apple now, then sell it next year, and hopefully only lose $200-300.
If you are positive that you want the redesign when it comes out, then I would buy a refurb from Apple now, then sell it next year, and hopefully only lose $200-300.