You have a healthy-looking plant there, no matter the size! It looks to me like it will start stretching quite a bit within the next week or so -- the good news is it'll stay nice and bushy. The bad news is it won't get huge, but you'll definitely have more than just a single-cola plant (which I have seen before). I'd expect something around 5-10g as a dry yield from a plant this size.
A few words regarding container size: I don't have much experience growing in soil, but my general impression is it's best to start seedlings in something like a red party cup with some holes cut in the bottom. You can transplant into a larger pot any time, but the smaller cup makes dealing with nutes and drain times much easier early on in the grow. As soon as you think the root system is filling up the cup, take the whole clump and put it into whatever final container you're going to use. The plant may or may not take a day or two to recover, but from what I've read the benefits of a smaller cup early on seem worth it.
Someone please correct me if any of the above information is in error!