Same here..... mine says "check your network connections" Network connections are ok tho. I haven't been able to log in to imessage or facetime since i bought the ipad mini a few weeks ago. I had heard apple was aware of this and was working on it?
Same problem here - i guess there is any problem with the apple activation server ?! It is also a new ipad mini, bought on 24th january.
Did you find any solution for our problem ?