This talk was by Carlos Garnacho, but sadly there wasn't any major announcements. Carlos basically classifies the current GNOME Shell 3.0 as being "mildly multi-touch aware." He classifies that on the basis of some features being touch-friendly while other features are in-accessible, but "nothing is utterly broken."
The GNOME Shell multi-touch support should improve a great deal with a GNOME 3 on-screen keyboard, when the updates to X Input 2 (i.e. X Input 2.1) finally arrive, and when the GNOME Shell Xi2 / multi-touch branches are merged. The X.Org multi-touch protocol is still being worked on and isn't yet in a stable xorg-server release. There isn't even a recent repository of the code, says Carlos, but just the patched versions of the X Server that Canonical is shipping in the 11.04 and 11.10 Ubuntu Linux releases. The GNOME support also doesn't depend upon Canonical's UTouch library.
Garnacho then commented on the basic gestures support in GNOME Shell, which currently includes moving windows, tiling to left or right, maximizing, and workspace switching. What he says would be "toppings" for the GNOME Shell support is proper desktop rotation (using either the tablet device's accelerometer or a hot-key), consistent input behavior, smart displaying of relevant options, and other items. Carlos then proceeded with a brief touch demo of the GNOME Shell.