I was surprised about the iPad 4 upgrade so soon, but that's life with technology. I don't upgrade every time something new comes out, unless its really drastic. I generally upgrade every other year. I've noticed that my devices usually tend to get much slower by then. I love apple products, they just work well, in my opinion.
I think Samsung changes devices way too much for me, can't keep up.
I won't get the iPad 4, my 3 is great, but I may get the mini. It would be so much lighter in my purse!!