In the Sicilian Taimanov, after the opening moves
[FEN ""]
[StartPly "12"]
1.e4 c5 2.Nf3 Nc6 3.d4 cxd4 4.Nxd4 e6 5.Nc3 Qc7 6.Be3 a6
7.Qf3 has become popular recently. I find it still a bit strange move however...What is (or are) the main ideas and perhaps tactical themes behind this move?