Developers, please continue to test your plugins and themes, so that if there is a compatibility issue, we can figure it out before the final release. You can find our list of known issues here.
I tried WordPress 3.6 RC2 and I got very disappointed when I noticed the deprecation of the wpdb::escape function, which was not done in the betas and not even in the RC1.
What is the purpose of the alphas and betas? Main development should be done there, especially deprecation and api changes, RC are meant for bug fixes only.
Deprecating a function in an RC2 means not understanding the software life cycles and not giving enough time to developers to fix their plug-ins.
I know is just a matter of changing to esc_sql for example, but again, I think you understand what I meant.
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