TEquipment in the US is taking orders now for the DS2072A, with shipping estimated late in November. But it is still unclear (from the lack of confirmation on this forum) whether the DS2000A models will be compatible with the upgrade techniques discussed in several threads here. It is possible the new models may have changes that prevent these techniques from working.
Although waiting to see whether the DS2072A will be compatible is certainly an option, it is also quite likely that once the "A" models are shipping, the DS2072's will be phased off the market. This has been my dilemma and, consequently, I decided to order the 2072 instead of the 2072A. But there are some determined minds at work on this forum, and there will undoubtedly be exciting things happening with the new models as well.