1.) I think Lin Beifong will teach Bolin how to improve his earth bending and teach him metal bending.
2.)I think Bolin might join the metal bending police force.
3.)Tarrlok is most likely alive, but badly injured.
4.) The creators might hook up Asami with Bolin.
5.) 1-2 might pass when the legend of korra comes back.
6.) The new villan they have for this season could be a woman.
These are just some of my speculations and thoughts, if you have any of your own or just want to comment leave them down below and tell me what you think about my speculations do you agree/disagree let me know.Thank You.