Weren't you aware of the impending release when you ordered it? If you spend much time around here, it shouldn't be a surprise that a new model will be out later this spring or during the summer. In terms of this article, wasn't it digi-times that said last week that most fo the ivy-bridge processors wouldn't be released until July, only to be debunked? I'd take it with a grain of salt.
No one knows when the new airs will come out. Best case scenario is still 2-3 months away. If you want to wait, just send it back. But it shouldn't be a surprise that new ones will be coming out in X amount of months.
I was aware new ones would happen between now and mid-year.
I'll not worry about it. Since this will be an evolutionary upgrade (nothing like retina display most likely) than I'll be fine. I only stress on this stuff as I tend to keep my Macs for 3-5 years.