I don't think so Lumia 925 will get raw support, nokia said it will be only available for Lumia 1520 and 1020 since they does deserve due to 20/40mega pixel sensor.
if Lumia 925 somehow gets RAW support then Lumia 920 too should get since both have the same camera hardware,(Lumia 925 have an extra 6th lens for sharper images ),rest hardware wise both 920 & 925 are same, but Lumia 1020 have an extra gig of ram when compared to 1 gb on both 920 & 925.will be interesting to see in future what nokia do with its old trusty Lumia 920.