I would take that bet. Having a Padawan would be great for both the Jedi Knight and Consular. Perhaps even you would have a Consular type companion if you are a Knight and a Knight if you are a Consular. They have said that companion characters will be able to supplement other players on missions so you won't always have to play with friends and groups if you cannot find one at the time. Personally, I like having a droid companion. That are loyal, usually don't talk back and, for the most part, always follow orders.
Since we know that in addition to the fact that companions will supplement our class and skill choices, we also know that there are going to be multiple companion options to go along with different play styles. I am completely on board with a padawan companion for Jedi classes. We actually see evidence of this already with one of the Inquisitor's companion filling the Vader role.
I could even see a droid coming along too...possibly filling an Imperial Agent type role, though probably slightly less dark than HK-47.