I would go ahead and start playing. There are going to be some significant changes but the game is great how it is, I wouldn't wait if I were you.Finished the tutorials to get a feel of the game. Would you suggest I wait for the patch to start the scenarios if the game will be a bit different?
I wasn't aware that the arty didn't work. But there have been some changes to the arty.. Some very cool changes...If the changelog can't be released at this state, is it possible to know if in this patch the arty will finally work?
I was also wondering if any of the released mod were "officialized" in this patch.
Finally, is there an ETA? Even a vague release date (this month, next month, next semester, next century) would do.

As far as officialized mods, I'll have to go through the list of new features to look (the list is long) but there are a few features from Rebbugler's toolbar that are being made official.
As far as a vague release date, Norb is best to answer that one, but I would say we are getting very close. There are still a few loose ends to tie up and quite a bit of testing, but all of the major stuff is done.