No matter when you upgrade your phone, there will be a newer one coming down the pipe that is better than your new one. Waiting for the next phone is a never ending cycle. All depends how long you want to wait or if your current phone needs to be replaced ASAP.
I can upgrade my phone in a week or so and was thinking about getting the droid DNA. But mobile world congress is in a month so im wondering if i should wait to see if something better comes out by summer or just get the DNA when i can.