At the risk of stating the obvious, the ZD, the ZD back, the upcoming Pentax MF, and the upcoming 1DsIII are all great news for the MF buyer.
At a minimum, the Phase, Sinar, Leaf, and Hassy resellers are going to be feeling the competition and will likely be more willing to give the buyer a better deal. But beyond that, choice is always good for the buyer and many will probably be quite well served by the "affordable" ZD and Pentax offerings.
Hans.