The Hearts of Stone Expansion, slated for an October 13 2015 release, will include completely new map locations, items, characters, monsters….and new gwent cards for you gwent lovers! Source (in Polish). The expansion quests are all going to be level 30+ and can be played either during or after the main story.
CDPR will also be releasing a patch fairly soon (probably sometime this week) to make some changes to the game’s romances. I’m guessing this patch will address the weakness of the Triss romance.
A CDPR spokesperson said this about the patch: “We’ll be adding some additional dialogue for Triss and Yennefer in the upcoming patch due to the fan feedback. We’ve read many opinions on our forums where gamers weren’t satisfied with the way their romance choices were fleshed out, so we wanted to change that by adding some extra conversational options.” Source
Lastly, CDPR will also be releasing an update for the MODkit relatively soon.