Hi Gang,
Intro: although a newbie to this forum, I am definitely not new to the platform. TLDR: I am getting one, asap.
Myself, I was somewhat on the fence about getting the iPad Pro. The logical alternative (in terms of the features and form factor) would be the Surface 3 (Pro). After all, Microsoft has been really doing great things with the Windows 10 platform, especially with Continuum and Universal apps. Well, I would like to think that...
That being said (first-handedly verified) the key point is user experience. While it is true that Apple's products are pricey, they offer, by far, superior and totally immersive user experience. The variety and quality of apps (ranging from games to productivity mills) is just more than you need. I don't know how about you guys, but every single time I run a quality app on my iOS devices, aesthetically speaking, I get goose bumps; Day One, Paper, or even Office for iPad - they are just phenomenal. I have yet to see equivalents for the Microsoft mobile platform that would be half as decent (yes, I am aware of decent exceptions).
In the end, it all comes down to this, I think. The way Apple designs their software is, to borrow an analogy, like a canvas and the devs are the painters. With excellent dev technologies and gradual improvement, modular design, and robust tools they are the only software (and hardware) company who has been so successful while changing/adopting platforms and programming languages. They simply treat them like vehicles for pushing the boundaries further. There is a reason Swift is, admittedly, such praise and momentum from the dev community; there is a potential in Apple's ARM designs to, some day, take over their desktops. As a former Computer Science academic I am amazed how well they have been able to do that, but I digress.
With the aforementioned analogy in mind, I cannot wait to see what the devs - be it indie dev shops or huge brands - have in store for the iPad Pro, and such, I am definitely getting one. I have no doubts that the future is very bright for this device. As far as the Pencil goes, it would be utter foolishness not to release one as a companion accessory.
Ending on a funny note, I have to give it to this guy:
He won the Internet. Cheers!