From oculus and p3d forums. Are you saying head tracking will work with only a recompile?
It does not say anything of the sort on the oculus forums.
The new headtracker requires use of the new SDK. So developers will need to recompile their apps with the new headtracking routines. There are some devs already using the tracking with games like DCS, but with 3DoF only. For 6DoF devs will have to add to their software to support it.
The SDK was only released a week or so ago, the first shipment of DK2's has only just arrived in peoples hands. So developers have had little time to update their software and drivers.