The B+ seems to be more than adequate for the job in hand and only hope that 6X more computing power does not meen 6X more wattage power
http://www.raspberrypi.org/raspberry-pi-2-on-sale/
The quotes and initial reviews seem to suggest it's slightly more power hungry than the B+, but not by much - similar to the original (and less efficient) model B.
I'm quite excited and have ordered one. The desktop experience of the Raspberry Pi is a bit disappointing, to the point of being infuriating if you're trying to use a web browser, so the extra CPU power is very welcome.
That said, I've got several older Raspberry Pis (including an earlier Model B with only 256Mb RAM) and they work fine doing what I've got them doing, be it media centre (Kodi/Raspbmc), NAS with 2 hard disks attached, or temperature monitor and chiming Big Ben bongs in my shed every hour
Ian