I currently have a build date on the tracker of 18th Jan, which has moved from 8th Feb in recent weeks. Im in the same position in regards to getting a good deal and have a car that i can keep hold of until it arrives. Just hard to wait so long!
I ordered on 4th May and was given a build date of 13th Aug which also showed on the Audi Tracking website, but so far hasn't been built. I'm still being told a delivery date of mid to end September but not convinced.