There must be something weird going on with manufacturers lately - first Huawei released an alpha build of ICS for the Honor, and now Sony Ericsson (soon to be just Sony) has released an ICS ROM for certain unlocked Xperia devices, including the Arc S, Neo V, and Ray.
Since it's an alpha ROM, it's not made for day-to-day use, as it is limited to just a few functions at the moment. As far as things that aren't working are concerned, here is the list, as provided by SE in the official blog post:



115,854
64,459
0
8,271