The closer we get to a potential iPad 2 release - and we're still probably several months away - the more questionably sourced rumours will pop up. This one, from a Japanese Apple-enthusiast blog, at least explains that weird case from before.
The word over at Kanteidan Blog (translated), from "sources in China", is that iPad 2 will feature wide-range speakers for better audio quality (the image above is an artist's rendering of what said speaker might look like, not actual photographic proof). Which helps to explain the mysterious opening this supposed leaked iPad 2 case:
That blue circle is where the current iPad's speakers are now - and bigger speakers mean a bigger opening. Makes sense!
Other rumours coming from Kanteidan include a flat, iPod touch-like back for the iPad 2, and a case that's 239mm by 186mm instead of the current model's 242.8mm by 189.7mm. No change in display size, so we could just be looking at shaving something off of that unsightly bezel. The iPad is supposed to ship from manufacturers in January, which would roughly line up with the expected April release.
So! Take all of this with an extremely large grain of salt. But even if the "sources from China" are unreliable or nonexistent, this is at least one of those rumours that also, mostly, matches up with common sense. [Kanteidan Blog via Boy Genius Report]