Sacre bleu!
I hope Geralts new aquaintences will have a hotel room with Eiffel Tower view, and lots of romance.
And maybe some Novel Cuisine cooks who use blood instead of wine and practize other cannibal and vampiristic preferences too so Geralt really gets new creepy and stealthy and Hannibal-style intelligent and charismatic and difficult to accuse two-faced enemys (rich aristocrats - maybe cooks or false doctors or highly decorated people at daytime, and vampire and cannibals and serial killers at night).
With lots of the new volumetric fog introduced by the HoS DLC and creepy Jack the Ripper London style Alleyways and architecture in some streets like Frogware`s "Sherlock Holmes vs Jack the Ripper" from 2009. Not everything should look like Paris
And maybe one of Geralts new Girlfriends should be a Vampire who has scruples in being a Vampire. And she don`t want to walk the night and suck blood anymore and because of that she asks Geralt to break the curse after lots of romance and love scenes, and tells Geralt a lot about her life like in the movie "Interview with a vampire" and "Twilight".
And plays sad tunes on her violine while the rain is dropping on the windows, and Geralt is overwhelmed by so much profound and warmheartedness from such a dark creature and completely falls in love.
They go for long walks at night after and have long talks and discussions, and Geralt must admit that he never before have someone met like her.
http://33.media.tumblr.com/95cb4e346dbb28cd7162e23fc044978a/tumblr_na5w4c8X9X1tiue71o1_500.gif
Aaaaaaw yes that would be perfect.
Shani is a little bit too rational and not really caring and loving like Triss did and therefore Geralt needs another and more dark and mysterious and loving and caring but gothic and creature of the night female companion whe really could be a thread to Geralt and Triss relationship.
And to connect her to Triss somehow.... well the Vampirella could be some old friend of Triss or even Triss first lesbian romance she never before talked about and she fell victim to a vampire curse and Triss barely made it out alive of the vampire castle. And Triss has sworn to kill all of them Vampires but cannot do this anymore when meeting Vampirella again and Vampirella says "if you don`t kill me I do it myself!" and tries to hammer a stake through her own heart but Triss stops her and begs her to bite and make a Vampire-Triss so she can enjoy the darker side of life. Because Triss cannot resist the immortality and powers anymore and Geralt now needs to save both of them from the vampire curse........
And much more stuff like that.
That kind of complicated and dark and gothic relationship would make everything even MORE than interesting and is way better than just some another girl-next-door flirt

(which of course should also take place in the new DLC there can be some regular flirts and love scenes too not related to the main DLC storyline).