You usually have to be a registered developer with Apple.
Yes, we are up to iOS 7 beta 4 so far and this beta is available to iOS developers.
Yes
You should be able to. Speculation at this point is that users with ios6 will be able to upgrade to ios7 with no problems.
Probably not. The only OS for iPhone currently in beta is iOS 6. There are is no iOS 5.1.2 currently in beta and iOS 6 should be out within a few weeks. Unless a security hole in the current iPhone OS is found before 6 is released, don't expect an update to iOS 5.
Ios 7 is the latest ios. Ios 7 is available on the fifth generation iPods, recent iPads and iPhones 4 and 5.
No.
No it did not. It had IOS 6. But you can get IOS 7 on it. Also when IOS 7 came out they put it on the iPod 5 in stores.
iOS 7 was unveiled June 10, 2013 it is currently in beta over this summer for developers its gold version will probably be released in September/October
ios 8 can be installed on ipad by first registering or have your device UDID registered by a developer and then download the iOS 8 beta and install it on your ipad
Yes, you can downgrade from ios 7 beta back to 6.1.3. The steps involved can be followed through the related link added below
Settings->General->Software Update It would be verry helpful for your device if you charged it while downloading the iso 6 beta 1. Also, your devive may not allow you to download ios 6 beta 1 if you do not have enough space left.
iOS 5 isn't out yet. It will be out on October 12, 2011. There are beta developer versions available but you need to be a registered developer to access them.