Updating this... This rumor was just verified through a very reliable source to not be true.
From a very reliable source on this rumored bit
"That rumor is wrong. Rogue trader is the opposite of a larger kill team. There's no Inquisitor"
The pic above is from Inquisitor Martyr. Love that pic. Would make an excellent miniature to convert.
Please remember that these are rumors. I do not know how solid this is, so unknown quantities of salt is required.
via an anonymous source on Faeit 212
Kill Team is "phase 1" small teams. Rogue Trader is lager scale - skirmish. Then you've got 40k battles KillTeam: Inquisitor - more of a individual character, rpg style game. Expect a series of them over the next 18 months.