The IRS instructions for the completion of 2017 Form 1098 indicate to report MI premiums received if they exceed $600. The instructions note that you should check the IRS web site for an update on whether Congress extended the deductibility of MI premiums. I checked the link, and there is no update referring to that provision.
So it appears that the latest instructions are to report MI premiums on the 2017 Form 1098. As to whether those premiums are deductible, that would be up to each taxpayer's tax preparer to determine.
Management is doing things right; leadership is doing the right things. Peter Drucker