It's a great computer. Don't second guess your purchase. Apple has a tendency to update it's products without notice. It's how they run. Whatever you buy from them, you're getting a great computer so don't worry.
I agree you can wait and wait and wait, meanwhile you go without. Technology changes fast enough anyway. If you purchase something today tomorrow it's old anyway.
You will love the MB and when a newer one is released you will enjoy thinking about owning it. Meanwhile enjoy the one you have or will have.