Drizzt Do'Urden and many other Forgotten Realms characters are coming in Neverwinter's Underdark expansion. This is actually really cool to fans of D&D and especially the books, because Drizzt and many other characters are a large part of D&D's pop culture.

With the upcoming Neverwinter expansion Underdark, we’re introducing a number of significant characters from the Realms into the game. 

These beloved heroes were made popular by R.A Salvatore’s many Forgotten Realms novels. Please enjoy the back-stories of these characters and the set-up of where you’ll be encountering them in Neverwinter!

I'm not going to spoil any characters other than Drizzt, but if you follow the link to the original article, they're all listed there, along with their backstories. The expansion / module's focus is the adventure of Drizzt and will feature a quest line written by R.A Salvatore (yayyyyy). It's really cool and worth picking Neverwinter up if you're a big D&D fan.

You can read the details on the official site.