Jabber support, in the sense of any client being able to connect to google talk, is perfectly active, hell I've got it open on my desktop right now.
Federation, the ability for having your own jabber network contactable by google talk users and vice-versa, that was (partially) turned off, after a string of spam abuses.
They actually temporarily broke Jabber support and then put it back on when people freaked out. I have noticed though that when I have hangouts conversations they don't seem to make it to my Jabber client...
Federation, the ability for having your own jabber network contactable by google talk users and vice-versa, that was (partially) turned off, after a string of spam abuses.