Baseless speculation here, but my gut tells me that Microsoft is going to put a remaster-focused studio to task on a current-gen Morrowind/Oblivion/Skyrim triple pack, a la the Master Chief Collection, to tide people over.
Remastering Skyrim is the easy way out, but Oblivion is still trapped on the 360 (if you don’t have a PC) and Morrowind is the darling title of the franchise that people would love to see remastered (and was recently used as an example by Nvidia on “how to remaster a game”). Remaster the earlier two and then just shove the Xbox One copy of Skyrim Anniversary Edition in there for funsies is something people would get behind, more than just another port of Skyrim alone.
Obligatory IANAL, but…
Generally a search warrant needs to be issued by a local authority, and that requires the crime to be prosecutable in the place where it was issued.
So in theory, California is potentially able to refuse requests to search for things that are not illegal in California but may be illegal somewhere else.
That being said, it looks like there are specific practices in place making it easier to issue warrants for electronic data like this scenario, even across state lines.
And in this particular circumstance, the alleged offense is even illegal in California (abortion of a viable fetus), so it’s a bit of a moot point anyways. A Californian judge would have issued this warrant if a local police department requested one.