Being myself a Bulgarian presently residing in the US, I was very surprised to see a topic relating to Balkan. My latest information dates two months when I was last home. Then Balkan has just started its renewed services to LHR, Dubai, FRA. Actually, I was even on the first renewed domestic flight SOF-VAR, and it was not on the ATR-42. The old AN-24. However, Balkan resumed offering flights to the US with Virgin via London, a bit too late because it was after I got to Boston on SwissAir.
Regarding those two interesting aircraft, it looks they are leased because this is not the traditional Balkan livery. I would not be surprised if the Balkan Holidays TU is owned by Balkan Holidays rather than Balkan. Balkan sold most of its TUs, I think to a company of former Balkan pilots called Bulgarian Air Charter - which is basically green on white livery. At least, about 4 of these TUs were parked at Varna International Airport.
It is a pity that Balkan got ruined. They have been infamous for their service but at some point the company leased 2 767-200ER and A320, and had direct service SOF-JFK. The bulk of traffic out of Sofia goes to the US, and all the money goes to BA, Lufthansa,CSZ,Malev,Austrian, etc but not to Balkan. At least, they were clever enough to work with Virgin, although I never seem to be able to be on these flights.
Well, anyway, I hope Balkan does not die as it is my national carrier, no matter the bad situation that they are in.