PG 7.3 support won't be in for 4.6 or 4.6.1, however I'm almost done with it for 4.6.2 (including dotLRN 1.0)
If 9i can hit 4.6.2 that would be utterly fantastic, of course, other than the fact that I may feel compelled to upgrade my Oracle server from RH 6.2 and 8.1.6 and installing Oracle just gives me bad vibes ... :)