Six team will compete for 250 000 dollars in the upcoming ESL Pro League Invitational which will be held in Dubai.
And according to Aftonbladet Esport sources, Ninjas in Pyjamas are confirmed as one of the six attending teams.

250 000 dollars will be on the line as ESL Pro League Invitational will take place between September 10-12.

According to the website 7DAYS.ae, the event will coincide with the GAMES 15 festival which will be held in Dubai during the same timespan.
– Dubai has hosted incredible Counter-Strike events in the past, and we are excited to go back and bring eSports to a stage unlike any other, Ulrich Schulze, Vice President of Pro Gaming at ESL told the website.

According to a source Aftonbladet Esport have been in contact with, Ninjas in Pyjamas  will attend the tournament. The competition marks the first time that Dubai has seen a tournament with the elite teams in CS:GO.

UPDATE: According to Dubaiprnetwork.com, the full team list is Fnatic, Cloud9, Ninjas in Pyjamas, Virtus.Pro, Na’Vi and Team ENVYUS.
Casting duty will be performed by well known names Joe Miller, Lauren “Pansy” Scott and Leigh “Deman” Smith with more names likely to follow.