Oh man, first of all the first update was released too soon because they knew they were behind so they tried to repay or delay further anger of their users by releasing if earlier. And now this new update that should finally work properly will be released god knows when.
I've been on 4.1 for 3 years now, before SP on my former xperia. In a year from now I'm a getting a new phone because the contract allows me that. So basically I can only hope to play with my SP 4.3 for less than a year which is really sad, and I regret my decision chosing it. To me the android version is all there is to phones nowadays, they are just displays running software..