Terribly sorry if it has been asked before, I'm not home right now, on vacation. Only a phone to check. Does someone know whether it is possible?

Not too sure about followers but people did say that there is a radiant quest after the vampire quest line that allows you to turn your spouse into a vampire.

Sadly your signature isn't true.

I'm also curious if turning said spouse into a vampire will allow them to become a follower, like Muiri for instance, an non follower. And to iZsoul. I found out about that this morning as well

Well , I have read some general information about the DLC.

It's like TES5.5: Skyrim 2 !
It seems HUGE !

Spouses yes, follower's I've only been able to turn one and that was my housecarl in solitude. You won't be able to turn quest giver NPC's like Aela the huntress and such.

Hmm, I wonder about those you have finished all quests for. I role play a lot. Okay, really long role play short. Karjio and I are good friends. did a lot of vampire hunting. (Like stopping the Morthal thing) I role played, and it's at the point where I've revealed to him that I was infected at Morthal, he was fine, I told him the benefits, he would be fine with joining me. So I'd like to be able to make him a vampire for role playing reasons.

It's all dependent on the quest Vingalmo (i think that's how you spell it) gives you it's actually completely random i got to turn my wife after 3-4 of those quest's but like i said it's completely random.