Upgraded my "live" site to 1.2. I put the word live in quotes as I have not promoted the site, but have a couple of members join, go figure. The upgrade went flawlessly, no errors and only two of my new style's templates needed to be merged. After all was said and done, the site looks the way it did before I upgraded. I just checked two of my add-ons and they still work as designed: forum thread views, and latest members on the home sidebar (I haven't checked the others yet). As always, well done Mike and Kier,
PS please do not use this post as a justification to upgrade your live site to 1.2, as I said I only have a couple of members and I also use it to write add-ons with. Also, the only add-ons I use are the ones I create.