So, after a week of waiting for the final dub version of Kai to released exclusively on Nicktoons.com, it is in fact ep.97 and not 98.

Quote Originally Posted by Nicktoons.com
DBZK Finale Week starts December 19th at 8PM ET! Tune-in each night to get secret codes to unlock exclusive content from Dragon Ball Z Kai's sequel series, DRAGON BALL GT! The final night code unlocks a Dragon Ball Z Kai ONLINE EXCLUSIVE LOST EPISODE, the true finale of the DBZK saga!
I assume the final episode will be included in the DVD/BD release.

Nicktoons - Dragon Ball Z Kai - Episode 98 Preview: