How has the application review process for NSF graduate fellowships changed? I was looking for some information on the site that might help for applications to the GRFP.  I found JeffE's answer to an old question extremely useful.  However, I noticed that some of the advice he gives appears to be somewhat outdated.  For example, the answer claims that it is a very bad idea to provide more than 3 recommendations, since any extra recommendations will be ignored.  However, the NSF site now states:


  Applicants are required to submit three reference letters. There are five slots available for applicants to list reference writers. Applicants are strongly encouraged to utilize all available slots.


Have there been any other changes to the application criteria in the last few years that might invalidate any of the points in the old answer? Is there anything new to consider?
First off, as a single data point, I was awarded the GRFP this year with only three reference letters.


  Each application consists of the following components: a 2-page personal statement; a 2-page description of past research; a 2-page description of proposed future research


Currently, the GRFP requires a 2-page Graduate Research Plan Statement, and a 3-page Personal, Relevant Background and Future Goals Statement. This latter essay combines and shortens the previously required 2-page essays.

That's the only thing in JeffE's post that is obviously no longer true.