@ the OP...
Here's my take since this topic has been beatin to death, it really comes down to 2 things?
A- How long can you wait?
B- How much money you have to spend?
If you can wait and dont need a machine right now, then I'd just suggest waiting and making due with what you have. Also if your ok with paying a high premium for a brand new just released computer in the early Summer months, again just wait.
On the flip side of that...
If you need a machine right now I'd suggest going out and buying one today! Yup today! And I'd also suggest picking up a 2012 if the 13inch model is what your looking into. From people I've spoken to and my own inquiries as for checking it out myself...The 2012 and the 2013 units are exactly the same for the exception of a small bump in processor speed...That's it! So if your into picking one up now, you can save yourself at least a few hundred dollars by grabbing a 2012 model.
I had the choice of getting either one, and actually still have the choice as I still have about 5 more days to still return and exchange. But in the end I went with a 13inch 2012 rMBP and got it for roughly $1,400! Thats a big difference when you factor in the 2013 model is priced at $1,699.
Either way you'll never be able to keep up, it's a very Vicious Cycle trying to keep up with technology...However I must say I Love my rMBP, best lap top i've ever owned.
Good Luck