The fleet guide PDF available on that site says, "...all-new 8-speed transmission mated only to the V6 engine"
On the next couple pages where it starts to list out features, it still lists (in two places) the V6 powertrain configuration as having a Five-Speed Automatic. The second mentioning also says W5A580.
I'm really hoping they stick with the 5-speed through the entire MY2012. I think the 5-speed engine/transmission control software could still use a little more tweaking, and I know once they move to a new transmission the chances of this go to zilch.
Chrysler needs to a 7-8 speed tranny as well as direct fuel injection in the Pentastar engine if they want to stay competitive in the powertrain department.
For mileage improvement, yes. Otherwise, the existing 5-speed (6-speed for 2010 V8, but same basic box) designs are -- post-TSB -- capable and proven. And foregoing direct injection means less engine noise and better valve lubrication.
That said, the ZF 8-speed has a solid track record and, being a newer design, will probably be supported for more years. But at some point -- Fiat is already planning 10+ notches for future Chrysler models -- all these added gears are going to be like with some bicycles, when riders have so many gears it becomes fiddly and doesn't really add anything meaningful.