He mentions it in a earlier post...I will try and find it.
Here is the post where he talks about the steps after the 2.6 release....at the time 2.6 was to be the first stable release but in one of the meetings they decided to push 2.57 to be the first non BETA release....so these moving to trunk may well be after 2.6, but I assume they will go in for the 2.58/2.59 release....MY ASSUMPTION is this will be in the next 6-8 months for 2.58...of course, I have no solid info on this.