Just like to note that Google now does work on all spirit roms. It just doesn't talk back. I tried CM10 last night and it was the same result for me. PG also said it's not talking back to him either.
The only fix I was able to find was for the official google now. And yes official versions of google now have had talk back issues in some cases, not all.
I'm pretty sure that on JB4.2/4.3 and KK4.4 it should work just fine. When I recieve my JB4.3 update that's the first thing I'm checking lol.