The nokia lumia line isn't getting WP8 due to one simple fact: it does not fit the hardware requirement. Even so, whats wrong with the current WP 7.5 OS, or the upcoming 7.8? Theres nothing wrong with it! Its perfectly usuable :S.
I wouldnt even want wp8 on my lumia 800, it works awesome and updating to wp8 might even kill the smoothness of the phone. What Apple is doing is kind of bad, they cramp their new OS, which requires more processing power, on their old modelled phones that simply dont have a CPU thats strong enough to fluidly use the new(est) OS.