Yep, I read bit about yesterday and device seems to be promising. I can easily imagine to make media center for TV. And for this price :)

Yes, we know you do.

Time to use my (self made) flyback converter power supply! XD

I'm wondering if it will be enough powerful for running GOG's old (Linux) games, or if it will have hardware compatibility problems.

Any benefit over a smart phone that most people will get anyway?

Windows has dabbled in other architectures since 1997 (codename Birch). The fact that most people haven't used it nor did they know about it doesn't change the fact that it was there.
From Windows 8 they have tried to make the ARM versions a bit more prominent, by allowing use of the ARM software on x86 as well. And now with Win10 they are offering a version of their OS for free to people who may be interested in it, hoping to change people's perception of it.

Whether it's worth using is a different question, and it does depend on what software is available for it. Thankfully, MS is also making developing for Windows RT easier, by allowing access to both tools and seminars. So let's wait and see how that works.
Not really, other than the fact that the Pi is meant to be fixed in a place and not carried around. If you want to set your smartphone to act as a media center in your living room, feel free to do so. But $35-$70 for a media center sounds much better than a $200-$700 one that may pause playing because it gets a call ;)

I'm quite surprised that Windows 10 runs on ARM processors. Not thaI'd ever put a Windows on a Raspberry...

Why? Windows 8 does. Why shouldn't Windows 10? It is not the same version as the one that runs on x86 architectures, but it is possible to run it.

Because I didn't know. Always thought MSW was x86 only.

It has to do mostly with the affinity of it all. When you say runs on windows 7 you have a large number of assumptions, including the architecture, that it's on PC, has keyboard/mouse support, etc. Yes windows 8 dabbed in ARM, specifically pushing it on the 360 & XBone (although it's x86).

But now, if you see games on steam or on the shelf at Walmart and it says requirements: Windows 10, is it ARM? Is it x86? Is it PowerPC? Windows 10 Phone?? Having a main OS that's on different architectures doesn't seem like it would work.

GNU/Linux is fine since it runs on everything (one of it's many strengths).

I'm not saying Windows 10 should only run on x86, but there's a very small percentage of people who actually know what they're doing. If i have a Raspberry Pi and see it running Windows, i'd probably at some point make a stupid mistake and try to install something that by name alone suggests it should run. It will probably have the same level of obscurity as when HD was still coming out, there was advertised HD content for cell phones to push hardware sales.

For argument sake I would said the cost is negligible if people are getting a smartphone anyway. And people would pause video to pick up a phone call.

So the redeeming point for me is can I play GOG old games on it so I do not need to keep my big old PC? Connect my mouse, keyboard and TV and play sacrifice, Widzary 8, HoMM3?

First of all, we are talking about a Pi. So no matter what OS you are running, you are part of the enthusiast crowd that does know what they are doing.
Second, I'm not sure about Windows 10, but Windows 8 did differentiate between Windows 8 and Windows 8 RT. Not to mention the hardware requirements which should list an ARM or a x86-64 CPU.
As for HD, let me remind you that HD is defined as any video of at least 480 pixels height, though it has lately (June 1st, 2004, see this press release) meant any video at least 720 pixels tall.
And remember that HD Ready and Full HD refer to specific resolutions, so a 1920x1200 monitor cannot display either of the two logos, since its resolution is different.

Has anyone tried GOG linux games on this beauty?

Unsure about these three games. The Pi is an ARM processor, so you'll need to run them through Wine (or another emulator). It does feature quite a few usb ports though (4 I think?), and an HDMI out, so you can connect any peripherals you may want, along with any compatible software.

On the other hand, you can use the Pi to do some nice things, like , [url=https://hackaday.io/project/1745-digital-stamp-with-inkjet-printing]this or any of these. The Pi, just like the Arduino, is a platform that you can use it to make what you want. And it is cheap enough to allow you to experiment without worrying (too much) about bricking it.

Regarding all the talk about Windows 10 on the Pi 2, I'm willing to bet good money that this will be stripped down version similar to Server Core for developing IoT applications on the newly multi-platform .Net stack. So don't expect to be able to install most applications nor to have it look similar to the regular Windows 10. It'll most likely just drop you into a powershell prompt at boot and that's about it.

As for the hardware itself, it's pretty nice, but considering that I already have a model B which sits unused I don't think I'll be picking this up quite yet, except if they manage to make the Plex server run on the Pi 2.