I'd personally wait for the announce of the next paid upgrade version this late in the cycle.
It's normally preceeded by a 'buy it now and get the next paid update free Sale'.
Seems to be the way most companies have gone recently, in effect in this scenario you'd pay the upgrade from Studio to Producer which will then also entitle you to the next 'Producer' release in one go. It is likely the 'Expanded' add-on trifle will be re-incorporated back into the 'Top of the Range' version too so they can sell modules to ALL users.
You heard it here first mark my words....
I also put a bet on that annoucement coming Christmas time ready for somewhere around a NAAM 2013 launch.