I respect all posts here, but judging from the pattern, it will be like this:
1. Mandalorian-character (maybe Ordo, maybe someone else, Mandalorian plays many part in KOTOR 1 and KOTOR 2, if notice it)
2. T3-M4 (yes, that droid is the connector between KOTOR 1 and KOTOR 2, so there's no doubt it will be in KOTOR 3)
3. HK-47 (the same as T3-M4)
Rest of the crew is depending from the main character for KOTOR 3. Some people say Revan will be KOTOR 3's main character, some say Jedi Exile will be. IMO, there will be a new character, so story can be expanded and connected to its successor ( Bane's era, Great Jedi Purge).
Most fun I've ever had with my clothes on!