about flexing ranking module in lucene

[Li Li]

hi all,
    In current lucene versions(2.x/3.x) , we can hardly modify the scoring
of documents because originally lucene adopt the VSM model and "matching
phase" and "ranking phase" are integrated.
    But In many situation, we usually use complicated boolean query to
"filter out" unrelated documents and score them by complicated business
logic.
    http://wiki.apache.org/lucene-java/SummerOfCode2011ProjectRanking seems
interesting. what's the status of this branch? will it be included in
lucene4 release?