8.3 performance

I came upon this article

http://www.internetnews.com/dev-news/article.php/3647376

The last 2 paragraphs caught my eyes:

"Among the improvements expected in PostgreSQL 8.3 are
further performance gains.

"'The most exciting of these is an optimization that
would improve performance on OLTP systems between 50
percent and 200 percent depending on the application,'
Berkus noted. 'However, that feature involves some
difficult engineering that may not be ready in time.'"

- what kind of optimization was he referring to?
- does it really improve OLTP performance across the
board by 50 - 200%, or does it only work in special
cases?
- Will the optimization make it to 8.3?

Thanks.

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