I finally managed to get my hands on one Raspberry Pi 2 and the first thing I did was:

to put a testnet masternode up & running


This hardware is clearly enough for now

Be aware that this is just a PoC type of project,
I don't have any knowledge about stability long term yet.
Quick reference:
Download Raspbian from the official site
http://www.raspberrypi.org/downloads/Follow the instructions to get it running on your Rpi 2.
Update the system
sudo apt-get update
sudo apt-get upgrade
Install the necessary libraries
sudo apt-get install build-essential
(this should be already present and updated)
sudo apt-get install libtool autotools-dev autoconf
sudo apt-get install libssl-dev
sudo apt-get install libboost-all-dev
sudo apt-get install libdb-dev
sudo apt-get install libdb++-dev
sudo apt-get install libminiupnpc-dev
This will install libdb5.1. The version used in darcoind is 4.8 so the databases created with this binary will not be compatible with the official binaries but it works just fine.
Then get the source and build
git clone https://github.com/darkcoin/darkcoin.git -b v0.11.1.x
cd darkcoin
./autogen.sh
./configure --with-incompatible-bdb
make
After starting the build, go get some coffee outside, spend time with your family or go and do some other thing you like because it's going to take a while to finish...
Once the binaries are ready follow the instructions to get the masternode running.
Enjoy
