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The IRS has not finalized the 2017 1040 Schedule A yet - they still show the 2016 version as the latest version.    
There are still several tax extender bills before Congress that they have not acted on yet that could affect the final version of the form.

Congress has until Dec 31 to change the tax law.   Here is the summary of a bill that does exactly that. I doubt that the IRS will finalize the form until they know the answer.

S.1977 — 115th Congress (2017-2018)
Introduced in Senate (10/18/2017)

Seniors Tax Hike Prevention Act of 2017

This bill amends the Internal Revenue Code (IRC) to extend, through 2019, the rule that permits individuals who are 65 and older to deduct certain medical expenses that exceed 7.5% of adjusted gross income. (A provision that reduced the 10% threshold for the medical expense deduction to 7.5% if a taxpayer or a taxpayer's spouse is 65 or older expired at the end of 2016.)

The bill also expresses the sense of the Senate that the reduction in revenues resulting from this bill should be offset by an appropriate amendment to the IRC.
**Disclaimer: This post is for discussion purposes only and is NOT tax advice. The author takes no responsibility for the accuracy of any information in this post.**