Apparently, one of the candidates is the present interior minister Nikolay Dobrev who recently criticized the prime minister Videnov and the whole cabinet (he himself belongs to) among other things for the failure to attack the economic problems and the wide spread corruption. It appears, another candidate is the foreign minister Pirinski who resigned recently and who lost (along with Yanaki Stoilov) the elections for the party post to Parvanov at the recent BSP congress. It appears, overall, Georgi Parvanov is a compromise figure for the opposing factions in BSP.
In his interview, Parvanov also mentions that he would support the adoption of a crowned lion as an coat-of-arms of Bulgaria, a departure from the official position of BSP so far.