Yes - one cast will cure 1 of each type - arcane, noxious, elemental, trauma
If you have mutiple effects of the same type it will require multiple casts
Cast/Recast is the same
we just need to make sure the range is the same as the current cures - 10m would be just stupid (I plan to log into test tonight before raids just to verify and /bug if needed)
Mages still only have cure arcane
Group cures remain the same
Here is the thread on the official forums with several dev postings and the test update notes (several cure aa lines are being augmented due to the change).
4 primary cures - will now be one spell...
Test Update Notes: Wednesday, April 30th, 2008