[Rails] The performance&memory footprint of Rails3

I just upgraded my application infrastructure to Rails 3.0.7 from
Rails 1.2.3.

After performance test, I found:
1. 15% downgrade time cost per request
2. 200% memory cost per process

I'm using lighttpd/fastcgi/rubyee.

I found that Rails 3.2 will improve performance & memory cost.
Where can I find the roadmap of Rails 3.2 and when will Rails 3.2
release?
Is there any workaround for short-term?

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