Let’s get the good stuff out of the way above the fold. Raspberry Pi 2 is now on sale for $35 (the same price as the existing Model B+)
Source -
http://www.raspberrypi.org/raspberry-pi-2-on-sale/
Major changes -
A 900Mhz quad core Cortex A7 processor
1GB memory
Obviously, max power draw bumps up to 4W
Its now more of a small form factor computer. More so as it can now run Ubuntu and MS Windows 10.
This is great!
I’ll buy it so that it can lie in my corner with my dusty untouched Arduino.
I was quite surprised by MS announcing that it will run Windows 10. I just hope IDM runs on the Windows 10 version that it will support. Then it will be the perfect downloading machine.
Windows 10 for the RPi 2 will only run modern apps. AFAIK, IDM is just a regular Win32/64 app, so it won’t work.
However, a regular install of Debian (Raspbian) or XBMC (Raspbmc) is a fully functional Linux machine, so you can install transmission-daemon on it for all torrenting needs. transmission-deamon can be controlled remotely via the browser or Win32 desktop apps like Transmission Remote or one of the several Android apps on the phone or tablet. I personally use and can vouch for GearShift, Torrnado, Remote Transmission and Transdrone. (Yeah, I use all four apps because they all have unique highlight features).
The RPi has been the perfect downloading machine for a few years, now!
I was totally excited yesterday when MS said that they’d give away Windows 10 for free on the RPi 2, but after thinking about it for some time, I don’t think that means much. There are hardly any really useful modern UI/universal apps out there and even fewer would be great candidates to run on an always-on, background, headless machine such as the RPi. Linux already does the job there perfectly. I’m way more keen on checking out the performance of ARMv7 Wheezy on that quad-core CPU and 1GB of RAM than Windows 10!
I am pretty excited… we can now say “cortana… start pron” 
btw, the regular win32/64 apps definitely wont work unless you compile them for ARM.
Quad core and windows 10 should be interesting especially if it can be used as a plex media server. I was looking into it a week back and was sad to learn that rasplex was just a client and the RPI was too we weak for this and Plex has no plans for RPI. Feel a bit optimistic now