Popular routes (e.g. TPE-N.A.), no advance release in general
Less popular routes (e.g. CDG/AMS/VIE and Intra-Asia), should have good availability still
e.g. I booked CDG-TPE for May 2015 on Oct 1, 2014, ALL kind of space, but there was no general return space from TPE-YYZ/LAX/SFO
Newest route TPE-IAH is wide open though