"Inbox Zero with Apple Watch Siri Watchface and Activity?

At this time, with watchOS 4.3.1, it's not possible to remove Activity from the Siri watch face.watchOS 5 is still in beta and there's been no indication from Apple that Activity can be removed, either. Of course, Apple has in the past added and removed features while the software is in beta so this could change before it's officially released.

1. Why did Apple announce the Apple Watch now when it is only releasing it in early 2015?

1. Apple always pre announces new products so as to stop them from leaking when they go into production.As an example: iPhone: Announced January 2007 Released: June 2007iPad: Announced: January 2010 Released: April 20102. The software needs a bit of fine tuning. It's probably only a beta version that we saw on the keynote.3. They would be happier to provide a longer Battery Life.4. Since it's an iPhone accessory, it makes sense for them to announce it with the new iPhones.

2. How can my Apple Watch help in an emergency?

A cellular watch can make a phone call, like to 911/999/112 or whatever emergency number. I think it can do that even without a plan (but it can definitely do it with a plan). The non cellular watch can do that if it is "close" to your phone, and in an emergency maybe you can't reach the phone, but can get to the watch. If that isn't helpful, the watch probably can't really help.Probably isn't the same as "nope" though. There are a few not so likely events where the watch is useful. If you have a Apple Watch 4 or newer, and have either turned on hard fall detection or are old enough that the watch turns it on for you (and you haven't turned it off)...and you actually have a hard fall the watch will (after making a bunch of noise and tells you it thinks you fell, and starts a 60 second countdown that you don't interrupt) call the emergency number for you (if it is a cellular model, or is close enough to your phone).That could be super helpful (like life saving), but it is a pretty narrow subset of "emergency".The watch can also detect some small set of heart problems and tell you something bad might be happening and you ought to see a doctor. There have been maybe a dozen or so stories about people that have happened to. All of them reported they were feeling off, or even really bad, and a few of them had thought about going to the doctor, but the message from the watch helped them make up their mind to do it sooner rather then waiting to see if it goes away. Most of the articles had doctors saying things like you can never be 100% sure, but probably they would have died or at least ended up in an ER with a significant chance of death if they hadn't come in. I would personally say those count as an emergency, but I would also say if there have been a dozen articles about it I doubt it has happened more then 100 times. 100 times out of the millions of Apple watches is a tiny chance that this will be an emergency that happens to you.I can't really think of any other ways. So "useful in an emergency" probably isn't a great reason to buy an Apple Watch (unless you go places without your phone & want to be able to make calls in an emergency). There are other things great about the watch, but this isn't really it.At least not to me, maybe you have a different opinion about the likelihood of heart condition, or a hard fall. If so don't let me talk you out of it. Alternatively you can have different feeling about "low probability" justifications.How can my Apple Watch help in an emergency?How can your Apple Watch help in an emergency?.

3. Why did Apple announce the Apple Watch now when it is only releasing it in early 2015?

This is pure speculation on my part but I am going to give it a go. One of the reasons why there was not a complete leak of the Apple Watch design was because it was not into mass production and there was only a limited amount of engineering samples to guard. However, once mass production starts, its going to be really tough. Thus, announcing it prior will allow Apple to set the stage and the expectations instead of letting speculations run wild.Another reason is Apple could have realized that they are not going to make it for the 2014 holiday season. Announcing it early could help to lock up possible alternative sales. The Apple Watch, unlike the original Apple TV and the iPhone when launched, has its own app ecosystem to make it a viable product. This requires integration and testing work with multiple partners both internally and externally. Things will definitely leak at this point of time.