While a lot can happen between now and then, a lot more stays the same.

If the candidate's campaign is based on selling the "I have a plan" concept, but the candidate can't prepare it until post-inauguration, then the candidate is selling smoke. There's a lot of "experts" out there who can provide succinct advice on the situation there to include trend analyses and tactical/strategic forecasts - the think tanks abound with them. And nothing changes that dramatically anyway - the demographics remain a constant, the geography doesn't move, the issues-at-conflict rarely stray, and the goals of the factions are relatively simple (albeit difficult to attain). All situations have a diplomatic approach and a militaristic (usually ending with a follow-up diplomatic) approach, depending if the former is successful or not. The old "five paragraph Operations Plan" format covering all facets of an activity is universal, and the person who says "I have a plan" but can't produce it in this format is snowing everyone except those who just don't want to recognize the obvious for whatever reason(s).

Anyone can claim to have a plan, and anyone can claim to be smart enough to make one. I just have a hard time swallowing the story that any candidate becomes a genius after saying "I do solemnly swear..." and only then comes to bat with the 'plan.' After the election, the first concern is always to repay the campaign favors and get the appointments in place - that takes a few months on its own. By then, the American memory (the President's and the electorate's) seems to dramatically fade as to what was promised and what will be delivered. As I go through the list of presidents since I became aware there was such a person, they all have followed this pattern.

Campaigns should not be a tease. If the candidate has an idea on how to do something, whatever it is, then say it now, not lead the public on with a rhetorical fan dance. If the candidate has substance - show it! The candidate that doesn't is simply another snake-oil salesperson whose second job should be selling band uniforms in River City. If the candidate is afraid that putting forward a plan is giving up his/her sales strategy for winning an election, then they are demonstrating self concern and public disdain.