What does FSX tell us about CFS4?

From the FAQ:
Q: Will aircraft from FS2004 be compatible with Flight Simulator X ?
A: Backward compatibly with existing 3rd party content is and has always been a priority for us, and we attempt to test as many add-ons as possible in order to provide the greatest level of compatibility.
This suggests that FSX will not be as 'revolutionary' a leap as CFS2 -> CFS3. To me, the implication is that much of the technology of CFS3 is dead and will not resurface in CFS4.
J_o_J
Q: Will aircraft from FS2004 be compatible with Flight Simulator X ?
A: Backward compatibly with existing 3rd party content is and has always been a priority for us, and we attempt to test as many add-ons as possible in order to provide the greatest level of compatibility.
This suggests that FSX will not be as 'revolutionary' a leap as CFS2 -> CFS3. To me, the implication is that much of the technology of CFS3 is dead and will not resurface in CFS4.
J_o_J