Prices at Dick Smith and Woolworths should be identical, especially seeing as they're all owned by the same parent company, with stocks due in those stores by the end of August.
It's the same story with the current iPhone 4, for example. Anyone buying one today is probably going to wonder in 8 weeks why they didn't just wait 8 more weeks for the latest and greatest instead?
Yes, the new Kindles will surely be more expensive, especially if they're Android-powered tablet models, but it could see even greater price drops for the B&W models, or new entry-level Kindles with ever more capabilities and benefits than today's models offer.
As I read elsewhere on the web, you could always just borrow some books from the library in the meantime, or even buy a book or two to tide you over until Amazon's latest and greatest Kindles start a new 'must read' frenzy of their very own.
You might also want to see what Apple launches within a similar timeframe - it could see that predicted iPad 2 Pro or iPad 3 make some kind of appearance after all, which might make 'regular' iPad 2 prices cheaper.
There's also other ebook readers out there to consider, too. Kindle might have been 'revolutionary' when it launched, but it's now one of many capable e-readers out there for you to choose from.
Buying one of the current Kindles won't be a swindle - it'll last for years and provide as many hours of reading entertainment as you can handle at an affordable price, with plenty of affordable content readily available.
It just might be worth waiting to see what new models arrive first, although how the story of any Kindle purchase you do or don't make ends up is an ending you'll have to write for yourself.