The online FAQ does address it by not including them in the list of units which you are specifically told to use the new entries for.
GW could easily have included all of the Ravenwing units in that list, but they left them out (apparently intentionally as they did include "Battle Company Squardons"). Since we are not told to replace them, we cannot.
I'd happily take 2 wounds on my attack bikes and deepstrike my speeders in exchange for a 3+ save, but alas, this is not allowed.
WARNING!!! INTENT BELOW!!! (Ignore as you see fit)
As for the Q&A:
"16. Ravenwing bike squadrons will continue to use the point costs, unit structure and unit weapons options specified in C: DA
YES
17. Ravenwing attack bike squadrons will continue to use the point costs, unit structure and unit weapon options specified in C: DA
YES
18. Ravenwing land speeder squadrons will continue to use the point costs, unit structure and unit weapon options specified in C: DA
YES
19. Can Ravenwing Land Speeders Deep Strike as regular C:SM Land Speeders can?
NO"
They were give ample opportunity to reply and expand to the bike question here, but simply state "YES" to the question as a whole. Had they instead replied "Yes, but they use the new stat line provided in C: SM", that would be a much different story. Why have them use the original cost, structure, and weapons, yet change the statline? Combine this with the fact that they deny RW speeders the ability to deepstrike, I believe that we can safely conclude that, until the Codex is released next year, RW and SM bikes and speeders are completely different and seperate units in all respects.
I understand why you feel that they should be the same, they're the same unit with different skills after all, and I agree. But as written, the RW bikes remain as-is.
Feel free to fix this temporarily within your local club until the new codex hits (a fine idea which makes sense), but per RAW, and in my mind intent as well, they should remain as written.