This is how MyDson romance initialy developed:

That's perfect.

No, of course not! 
I wish I could. 

I love Andrew, so am always happy to see him!

Ivy wrote:

Mark Gatiss: The Sherlock special will "completely" solve the mystery of Moriarty’s return. But will it be the last we see of the arch-villain? “Well, it’s very hard to put a lid on Andrew Scott…” teases the series co-creator


full "Radio Times" article here -> http://www.radiotimes.com/news/2014-11-19/mark-gatiss-the-sherlock-special-will-completely-solve-the-mystery-of-moriartys-return
 

 
Sure Mark.  Tell us anything. 

I'd be happy with those.

The funny thing is that Radio Times seems to be thinking that Moriarty's return is the cliffhanger while a look at this board shows that the real cliffhanger and even the source of disharmony in the fandom (to put it mildly) is not him but Mary. 

Moriarty as a cliffhanger doesn't work too well for me.  We saw him die, and although it would be quite possible for the writers to make that a fake death, it would spoil the story (for me).  Instead of being terribly clever in TRF Sherlock would have been completely fooled, or even collaborating with Moriarty.   And there are just too many fake deaths (and almost-deaths too!).   It would feel like a surprise for the sake of it, and I'd be disappointed.  (Unless it's really, really well done). 

Mary as a cliffhanger works much better for me, providing it ties in with everything we see in HLV.  I do think she could be a very interesting villain. 

Liberty wrote:

Moriarty as a cliffhanger doesn't work too well for me.  We saw him die, and although it would be quite possible for the writers to make that a fake death, it would spoil the story (for me).  Instead of being terribly clever in TRF Sherlock would have been completely fooled, or even collaborating with Moriarty.   And there are just too many fake deaths (and almost-deaths too!).   It would feel like a surprise for the sake of it, and I'd be disappointed.  (Unless it's really, really well done). 

Mary as a cliffhanger works much better for me, providing it ties in with everything we see in HLV.  I do think she could be a very interesting villain. 

I agree.  If Moriarty is really still alive I will be deeply dissapointed.   Hoping for a sham of some kind played by one of his minions.
 

I would love for Janine to be the next great villain! How clever would you have to be to share Sherlock's bed (though apparently very little happened there) without him realizing what/who you are? Sounds like a criminal mastermind to me. Though I hope that if she comes back as a villain, it is for more than just the special. But then the special might just be setting up the stage...

I have written this elsewhere, but I think it would still be a nice nod to the cannon if Mary would be written out (in which from whatsoever) during this special (in-between seasons as opposed to in-between stories). Amanda said in an interview that she knows how Mary is going to leave, so it is likely in the near future (though season 5 is apparently already plotted, I tend to think it is going to be earlier than that, but I could be wrong of course). Maybe Moriarty (or whoever is behind that gif) is responsible for her, ehm, removal?