It is reported as JQ1, android 2.3.3.
I am currently checking if this information is true.
More precisely Samfirmware confirms what I posted here.
So far, it is all cross-references... :(
Still I can confirm that three different users reported the update.
Since I am running a custom rom (a mix of Overcome, Rotohammer and MoDaCo), Kies does not recognize my device nor inform about updates.