New this build: automatic memory management, to reduce the memory usage of large projects. Basically, this means only the current layout's textures are loaded in to memory. When going to a new layout, new textures are loaded and old textures no longer being used by the layout are released.
In this initial release, automatic memory management only works in the WebGL renderer. This is because the canvas 2D in HTML5 does not provide explicit memory management functions. In this case it's down to the browser to manage it automatically, so you just have to hope the browser does a good job. We are also working with appMobi and Ludei to add support for memory management to directCanvas and CocoonJS; while it is not currently supported, future versions of both should be supporting this as well, which should fix issues with large projects crashing due to running out of memory.
We're hoping to make a stable release before the launch of Windows 8 on October 26th, so if everything goes smoothly we'll make r108 a stable release. Be sure to test well and report any bugs you find!
p.s. Tom's still rolling out the new site design - this release page will be tweaked a bit more over the next couple of days.