I'll see if I can get a clear answer from them, but they are usually a rather reliable source.
EDIT3: It appears that there are right now a total of 14 Su-34s flying. The 6 delivered are 03-01, 03-02, etc. through 03-06. There are also bort numbers 01-09, out of which 06-09 were built as part of the 32 plane contract (meaning a total of 10 birds have been handed over as part of the contract). The original 01-05 will remain at Lipetsk where they will likely be used for pilot training, while 06-09 will go to Baltimore, to join the new arrivals. To confuse things even more there will be two bort 06s at Baltimore, with 03-06 of the new built, and regular 06, that was the first plane built under the contract.