Ripped straight from my Jedi Outcast fan-site..
Weapons officially announced by Lucasarts as returning include:
2. Bryar blaster pistol
3. Blaster rifle
4. Wookie Bowcaster
5. Thermal detonators
6. Stun baton
I think that answers your question.
As to what other weapons we'll see, who knows? Well, apart from Raven/Lucasarts, who knows?