The "4GB" in the title implies that this Arcade version has 4GB of storage included, either as NVRAM or in the form of a USB flash drive. (The soon-to-be-obsolete Xbox Arcade only has 512 MB of NVRAM.) The price is listed as €148.99 ($189), which is slightly lower than the $199 Microsoft told us, not to mention that "bundle" suggests it will include a game -- or maybe something Kinect-related.
Then there's the street date, which Amazon has down as August 20, 2010. While that confirms nothing (as retailers are notorious for playing fast and loose with release dates), we will draw attention to this: That's smack dab in the middle of Gamescom 2010. Shades of Microsoft's E3 revelation of the new Xbox 360 and that it was shipping immediately? Stay tuned.