The second-generation Nexus 7 has one of the highest pixel density displays for a tablet to date. Apple could opt for the same display technology in the iPad Mini Retina.
The technology giant can't catch a break: for the most-leaked iPhone to date, Apple today delivered the nail in the leaky coffin.
Apple is constantly providing developers with test builds of the next OS update so they can ensure compatibility with their programs, drivers, and system services. When an update is nearing its public release date, Apple may increase the number of developer releases and some may be tagged with "no known problems" or similar phrasing. When this happens we may see the update released in the next few weeks if not in a few days, but before you decide to install it be sure you have your system prepared and have considered options for installing.
Installing Windows 7 over Vista gives numerous advantages, even if only for OS stability; however, to date Apple has not officially supported.