So, all of the things listed in the title are now a reality, with iOS 8 the first available, as it was released around two hours ago.
iOS 8 is a reasonably sized update, bringing with it things like like Health, which is an app where it puts various health data from other apps together as a sort of hub. They're also adding widgets after years of not having them, allowing you to change your keyboard (SwiftKey here I come) and they've added a lot of stuff to iMessage, the Photos app and so on. It seems like there's less new stuff this year but it might just be that last year the whole UI changed so it seems like less. There are lots of improvements though, the most noticeable so far being that I asked my iPad to download it about half an hour ago, expecting it to take several years like it has done in the past on the day of Apple releasing the next OS level, but it has actually took all of ten minutes to download.
iPhone 6 has a bigger screen, and iPhone 6+ has an ever bigger screen. They have a new design:

And also NFC (allowing contactless payments in the form of 'Apple Pay', which is some new secure payment system) and better processors and camera sensors.
Apple Watch meanwhile is a new thing that has a touch screen but then primarily uses the twisty knob that's often found on the side of the watch (apparently called the crown) to control the UI. It works with your iPhone (which it'll need for full functionality) and can run a few apps (although your not going to reading Twitter on it from the looks of things!). They're making an 18-carat gold version of it for those with money to waste too. Here's a photo of the non-gold version:

I wasn't too big a fan of the iPhone 6's looks at first, but they have grown on me and I think I might get one when the price drops a bit. I am fully aware I could get an Android phone for (probably) less and in some scenarios better specs (the one+one for example), but I still find Android to be a fragmented experience - the HTC Sense UI on my One S is nice to look at and most of the stock apps follow the same style, but then almost all of the apps from Google Play (including the Google ones) follow the stock Android UI styling for the most part. The issue here is that the most popular phones don't use stock android UI, although more are beginning to vaguely resemble it.
Another problem Android has is that devices seem to lose support from manufacturers very quickly, with software updates stopping. I believe manufacturers are improving on this but on the most part it isn't good - my One S was the phone just below top-of-the-range when it came out and whilst it did get software updates, it took a while for HTC to release them, and then in turn a while for O2 to chuck all their bloatware on it and get it out. However, after one big-ish update it stopped receiving updates and so I am still on Android 4.1 when the latest version is 4.4.4. Compare this to my iPad 2 which started out with iOS 4.3 and is now on iOS 8 FOUR years on and it looks pretty poor on Android (and phone manufacturer)'s part.
As for the Apple Watch - I'm tempted. Until it comes out though it'd be silly to make a decision as most of the stuff we have on it is Apple marketing guff, so it remains to be seen if the 'digital crown' actually is good or not. Saying that, they do appear to be talking sense.
Be interested to hear your thoughts.
EDIT: Added some photos to save googling if you don't know what the new devices look like - they're on the large side as they were some of the only ones I could find from Google images that were the actual device, with most of the photos mockups or leaked prototypes etc.