Everything except Diablo will be there at the time of official release on ScummVM site. It was like this with previous releases too. scummvm is in extras since 0.9.1 (?).

For Diablo extras there is this 'autobuilding from source' requirement which is not met yet.

Source is there of course since day one. And now there is even Makefile workaround for internal compiler error in one source file so it has chance to be built without manual intervention. The missing bits are checking and testing all dependencies in extras (mad,ogg,flac,tremor,mpeg, i think at least tremor is not in Diablo) and making uploadable and buildable source.