I would buy it now and wait until BMW fixes all future issues with the next M4 model (maybe 2015?).
In regards to the DCT, I have 10k miles right now and no issues at all.
Good luck with your final decision and welcome to the forum!
Oh, and this car is TOO good of a DD. I want to put it away for the winter, but have not done it yet. In fact, I'm taking a road trip through the Alps this weekend
