All hands on deck! Within the next few hours, we need to get https://core.trac.wordpress.org/report/6 to basically zero tickets.
Some of these patches will have a bit of a learning curve, but you can help with testing! And are there a lot of things to test — a near constant stream of patches. We will be in #wordpress-dev for the rest of the day.
We are hoping to do a soft RC4 early evening (so, five or six hours), which still means we can release tomorrow if the stars align. Cross your fingers. Actually, if you can help while crossing your fingers, you can improve the success rate of your own finger-crossing! Woo.