Too good to be true? Well, according to this page
the offer goes "Purchase a H3DII-39 Kit (includes 80mm lens) between now and September 30, 2008 and you can get an additional lens of your choice for $2500! Be guaranteed first access to the new H3DII-50 when it is launched in October 2008, and be able to upgrade your H3DII-39 to the new H3DII-50 at a cost equal to the difference in list price.
So, you get free use of an H3DII-39 until October provided you are prepared to pay the list price of the new H3DII-50 and
you get to have an extra lens for only $2500. Unmissable!
Seriously, I guess if you need this sort of kit then it's a good deal. For some, having 50MP spread out over a 36×48mm sensor must be Christmas come early.