I just saw this yesterday, I think.
From Mouseplanet:
An extended preview of
Alice Through the Looking Glass begins Friday, May 6 at Disney California Adventure. Unlike past several such previews that were hosted in the Bug's Land Theater and which forced temporary closures of the "it's tough to be a bug" attraction, this preview is being hosted in the Sunset Showcase Theater in Disney California Adventure.

The former Muppet*Vision Theater has been renamed the Sunset Showcase Theater.
If that name doesn't ring a bell or if you're wondering if you're reading the wrong resort update, that's because the Sunset Showcase Theater is Disney's brand-new name for the former Muppet*Vision 3D theater. As we've reported, that Muppet movie attraction, which closed to make room for the
Frozen sing-along show, has been removed from the Disneyland web site. Now that the
Frozen show has closed in advance of the debut of the new stage production at the Hyperion Theater, Disney has renamed the Muppet's former home. Bicoastal Disney fans have every reason to be confused, as there is also a Sunset Showcase Theater at Disney's Hollywood Studios in Florida.
The name change is a good sign that the Muppets won't return to Disney California Adventure in the near future, if at all.
Alice Through the Looking Glass opens May 27.