If you invested through a brokerage, contact them for more information as to how and when your Schedule K-1 may become available. Yes, the regular due date for issuance is March 15th. In order to file an accurate return, wait until you have the K-1 before finishing and filing your return.
See this article from Yahoo! finance regarding ETFs and Schedule K-1, including a list of those who issue Schedule K-1s because they are structured as partnerships.
Securities that issue a K-1 may require investors to report and pay taxes on gains annually, even if the security has not been sold.
See also this TurboTax tips article for more information on Schedule K-1, and this one for help with entering the K-1 in TurboTax.
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