I know it all depends on what I've got right now and if I "need" a new laptop now.
I just want to know exactly how much better Haswell will be. I know it will be a major jump when compared to Sandy vs Ivy, but is there anything else to say about it? If it's not revolutionary, then I have no problem with Ivy bridge, but if it is something big that makes it so that apps made for those processors will have trouble running on Ivy, then I am concerned. Will it have more cores? Higher clock speed?
As far as processors go, I'm pretty content, so I'm not as worried about Haswell as I am about the next-gen graphics cards. The 650m is barely enough for my needs and if a truly significant graphics card rework is coming up then it's worth the wait, but is that going to happen or did Nvidia just have its "tock" with Kepler?
If you want the latest and greatest you'll always be waiting. Next year you will be asking if its worth it to wait for broadwell.