Microsoft CEO Steve Ballmer plans to do something today — or sometime soon after — about Yahoo, the Wall Street Journal and its News Corp. cousin BoomTown report. Neither publications knows what. The Journal, reporting that "Microsoft's Next Move on Yahoo is Imminent" says that Ballmer has a slate of 10 directors and 3 alternates lined up to replace Yahoo's board. The Journal also reports that Ballmer's options include — but are not limited too — walking away from the deal, filing for a proxy fight or announcing the slate. BoomTown's Kara Swisher confirms that something should happen today or in the future. "What exactly that move will be is still unclear," Swisher writes. "But sources said it could come sometime after the stock market opens tomorrow."