I don't care, my wife and I got ourself 2 new 2012 macs ( cmbp for me ant 13 inches air for her). We had 2 early 2008 15 inches MBP that we gave to our twins sons and both laptop run really well, just upgraded the ram to 4 g and voilà!
I needed more power for work and my wife wanted something shiny!
Just like with the 2008 laptops, we should be good for a few years no mather what Apple does. And I had the Ipad 2 then I bought the third gen when it came out. Total waste of money, gave my older son my iPad 2 and there is nothing that I do that he can't!
When my iPhone 4 broke under warranty, Bestbuy gave me a 4S and I have to say that it is a lot more powerful so for some switching might be worth it IMHO.
I did'nt switch it for a 5 but I certainly will buy the 5S or whatever it is they call it when it gets out.
So no, I don't care but when I want something, if I can I will wait for the latest just like I did back then for the iPhone 4 and lately for the 2012 MBP. And if Apple release something new 6 months later, well good for them, I won't loose sleep over it.
