I may have something. I just got back from the shop having the same surging issues as everyone else. Of course the tech supposedly couldn't recreate the problem. Anyway, he ran a check for any new pcm updates and found one. On the report it says PP120XRX QCCP 60404001-06 PCM REFLASH - EVAP. I had my car reflashed months ago, so this one must be somewhat new (maybe not, I've been out of the loop for a while). Anyway I flogged on the car for about 40 miles and my surging issues have pretty much gone away. i used to be able to recreate the problem consistantly and now the car is running very smooth. I still think I notice a small bump here and there, but I may be imagining it. Either way, it is much better than it was.
I had the service done at Crippen Mazda in Lansing MI if that helps anyone.