Hi, I'm not seeing footer widgets for 3.5 RC2, multisite, in either the main site or the sub-folders, on either Chrome or Firefox.
I see it neither in child themes, nor in default theme.
footer.php is intact in the TwentyTwelve theme.
No plugins are activated.
The test/prototype site may be seen here:
Any insights you have would be appreciated--and again, to the WordPress team, thank you for the amazing work you're doing!