They ended 2017 wrapping up a five-year campaign (so the first half being played off-line at Matt's home and the second half streaming every Thursday) and kicked off 2018 with a new campaign, so this has been a pretty good time for new fans to be introduced without having to feel like they need to power through 115 episodes (each averaging between 3-5 hours) of the first campaign (each episode is posted on YouTube the Monday following the live Thursday broadcast).
Note before watching the videos, probably NSFW (not safe for work) as they do throw out a lot of profanity.
Highlights from the first episode of the new campaign with new character introductions.
Liam O'Brien (Naruto, Doctor Strange in various Marvel projects) - Caleb Widogast, Human Wizard
Sam Riegel (Phoenix Wright, 2003 Teenage Mutant Ninja Turtles) - Nott the Brave, Goblin Rogue
Laura Bailey (Chun-Li in various Street Fighter projects, Black Widow in various Marvel proejcts) - Jester Lavore, Tiefling Cleric
Marisha Ray (Fire Emblem, Metal Gear Survive) - Beauregard "Beau", Human Monk
Travis Willingham (Thor in various Marvel projects, Fullmetal Alchemist) - Fjord, Half-Orc Warlock
Taliesin Jaffe (Blanka in various Street Fighter projects, Tales of Zestiria the X) - Mollymauk "Molly" Tealeaf, Tiefling Blood Hunter
Ashley Johnson (The Last of Us, Ben 10) - Yasha, Aasimar Barbarian
And if you want to watch the first episode of the new campaign in full.