WP 1.3 stable?

Well that’s definately not something I know, since I just started alpha testing yesterday. However, I can say that the only bug I have found is some sort of sessions error, but I’m still not convinced it’s not my computers doing.
I know that doesn’t answer your question, but perhaps it will give you a feel of what’s going on.

When it’s ready.
It’s not gone to beta yet.

Version 1.3 is still in the ALPHA stage, which means a lot can change very quickly, and also, a lot can suddenly be broken in a new nightly.
Using 1.3 on a production site is risky, but if you don’t mind a bit of risk, then jump in with both feet.

Your patience will be rewarded with a remarkable piece of free software.

i’ve been using 1.3a4 and am loving it. even though one must be careful because of the ever-changing code that goes in and out of an alpha product i consider 1.3 a great piece of work.