Since Rupert Murdoch’s News Corp. acquired Dow Jones & Co. last December, nary a day goes by without the flagship Wall Street Journal — either in print or online — making another change. On Wednesday WSJ.com introduced “Journal Women,” a section dedicated to executive women. Meanwhile, in a surprise to no one, the Journal earlier this week named Robert Thomson as its new managing editor. He succeeds Marcus Brauchli, who was part of the previous regime and got the nudge last month. Thomson, who has worked with Murdoch for years, is expected to speed up changes at the Journal.