On your mark … get set … wait. The SEC’s pending approval of dual share classes may be the biggest story of the year for ETFs, but it may nonetheless be a while before ETF share classes of mutual funds, and vice versa, become available to investors. Following the regulator’s notice on Monday that it is set to greenlight Dimensional Fund Advisors’ request for dual share class exemptions, the company noted that it would launch share classes as soon as it is ready. That firm is certainly well ahead of most o ...