So NQ43 had some insight into Bog Trogs for the IKRPG and I must say I was pleasantly pleased with the small snip it we got for them and the possible implications it could have for future Blindwater releases, especially Rask.
From the article Bog Trog Ambushers remain pretty much the same. They don't seem to have rules for ambush or reach that I could see in the RPG but stat wise everything else is there.
The new things are Bog Trog Anglers, Mist Weaver, and Big Fish. Anglers are the ranged option of trogs sporting both thrown tridents and nets. The Mist weavers are the shamans giving boundless charge and concealment out. Finally Big Fish are the chieftans and they pack quite a punch. They have a sword and shield and plenty of melee special abilities.
So for Rask we can assume like the other gator warlocks that he started out as a shaman of sorts. That means likely spells are boundless charge and fog of war. I think these spells would be a great addition to Blindwater and as long as he had some offensive buff skill/spell/feat he'd be awesome in my book.
I for one hope to see a unit of Bog Trog Anglers added to the game sooner than later however with shamblers coming in I would think we're probably a couple of books away from seeing them.
The Big Fish I would like to see as an attachment to any bog trog unit and have him add his melee prowess and hopefully some nice buffs to the unit.
Go pick up NQ43 lots of good stuff in there.