Look at this...

http://www.projectconstellation.us/a...jpg&fullsize=1

Looks like Boeing is designing this as part of the new lunar
initiative. It could easily be added on to the space station as a hab
module. I now predict the following...

Node 3 will be used as a makeshift Hab module with "cots" for two
crewmembers (one or two more can sleep in the two Soyuzes that will
have to be parked to the station. After CEV is deployed, additional
crew members could move in there (the Russians may continue to keep
one Soyuz attached to ISS after CEV is deployed for national pride,
though I see no reason financially and logisticly to do so, other than
to show their independence).

Then, a few years later, this Son of Transhab, as I now call it, will
be deployed to ISS, attached to Node 3, as its new Hab module. Boeing
will sell NASA on the idea by using the logic "for a little more,
we'll build two... one for the moon (as is its cause for development)
and the extra one you can use for expanded station crew capability. I
believe NASA will buy it, but the dtermining question is will
Congress?