Raised undead can no longer follow you into certain instances without dying, by the time you transisition through the loading screen they come out as an ash pile right beneath your feet. Its virtually pointless to move dead bodies around the map now because they won't be able to follow you anymore. Way to go Bethesda, you just made an extremely underpowered spell line even more useless than before. There is virtually no reason to buy any of the raise dead spells now.
According to the UESP, if you raise dead with staffs, they do not turn to ash piles, so you can repeatedly raise the same body. Do you know if this remains true after the 1.4 patch? I am on PS3, so I don't have the patch yet. Anyhow, if staves let you repeatedly re-animate the same body, that might provide a path for folks who want to play a necromancer. Not an ideal solution, but at least it is something. With a high conjuration skill you could get a lot of uses out of a staff before having to recharge. And eventually you'd get the master perk. I don't have a necromancer yet, but am thinking of starting one and hunting for a good staff.