I like the look of this new Font, and I agree its been way too long between major OS changes. As for people discussion version numbers, its been known for many years that 6.0 is major release, 6.0.3 is a minor update, 6.3.0 would be a more major update but not as many changes as going to version 7. Whenever the first number of the version changes to the next, this is classed as a major software change, usually including numerous bugs, features, and UI changes, or even a re-write in some situations.
As for the font love it, however bear in mind any people over a certain age who have reading difficulties amy find the thinner font makes it harder to read certain aspects on the phone, including icon names, application names etc. This font looks a lot more stylised and also makes it easy to associate iOS 6 and iOS 7 purely just with the blink of an eye. As for the colours I mentioned in my previous post, these line up withe the colours of the WWDC logo.
Its possible the new icons will be translucent (not transparent) which makes them easier to identify due to the bright colours, and maybe even see other icons inside any folders as well (reminds me of the 3M coloured post-its). I suspect colours will be the main identifier - colour coded I suppose you could say. Skuemorphism will be dumped, as this makes the OS less modern over all, and is now post-Forstall. Applications and settings should now have a contiguous colour system, as currently even the colours and button layouts of even settings etc are all randomly placed.
Also bear in mind, the iPhone will probably get this iOS 7 first, and this will funnel down to iPod, iPad, iPad Mini, etc.