No new Raid.
Quote:
House of Wolves will not have a Raid activity. We didn't make this decision lightly. Our team has been humbled by the reception of Raids in Destiny and we are creating a new Raid for a release later this year. House of Wolves will have a new cooperative end game activity focused on variety, replayability, and skill – a new battle Arena called The Prison of Elders.
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https://www.bungie.net/7_Gearing-Up-...News?aid=12764
And apparently, Prison of Elders is 3-player fireteams only. Disappointing.