Better make sure there's plenty of gas in the chainsaw, kiddies, because Leatherface isn't dead yet. Last week saw the release of 'Texas Chainsaw 3D,' the seventh film in the 'TCM' franchise, but the first since the rights transferred over to Lionsgate. Well before you could say, "unnecessary followup," Lionsgate has announced that they are moving forward with another entry, which they are dubbin…