I could imagine them implementing a few more attachments. Each one could do something different: the vine atm does poison damage, maybe a frost one later on could give mini-stuns or something.
In all honesty , I think that this was a once in a while thing for them. I mean I remember a few of my friends going crasy spending up to 100M on the whips vines and then they crashed a day later. I don't think they will be adding updates like these that often, or ever again. There was too much negative feedback on the forums about the whip vine, so I doubt they will add more.