Frequency of Score Recalculations?

I'm wondering what would happen if June 5th comes along and all of the Integrated Reasoning questions are far too easy?

Let's say IR is scored like the AWA but much easier (since it is new), with a "6.0" at 80th percentile and a "5.5" at 20th percentile...then wouldn't GMAC have to re-scale scores fairly quickly? (Since the IR scores would be statistically useless)

If this is the case, wouldn't people taking the IR section early be given an "unfair" advantage over people who take the IR section when it is established?

For example, I could take the GMAT on June 6th and get a perfect IR score, while the same effort in the near future could result in a score in the 60th percentile.

It's interesting how Manhattan GMAT / Kaplan / etc are telling everyone to take the GMAT before June 5th, but taking it soon after could actually be an advantage, especially if one deals with spreadsheets and statistics on a daily basis.