Should I repot this Dracaena Marginata plant?

Someone bought me a dracaena marginata for Xmas, and I'm happy with it, but need some help since I've never owned a houseplant before. I was going to repot so I took the plant out of its plastic container. I was surprised at how little soil there was in the pot. Here are a few... show more Someone bought me a dracaena marginata for Xmas, and I'm happy with it, but need some help since I've never owned a houseplant before.

I was going to repot so I took the plant out of its plastic container. I was surprised at how little soil there was in the pot. Here are a few pictures:
http://i186.photobucket.com/albums/x131/...
http://i186.photobucket.com/albums/x131/...
http://i186.photobucket.com/albums/x131/...

But then I read that plants should not be repotted in winter, nor should they be repotted within two weeks of purchasing them (to adapt to its new environment).

So should I repot now or wait?
The current plastic pot fits well into a 8.5" pot. Should I move up a pot size?

Also the plant tips have been browning, but I think it might be because of humidity deficiency..
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