I've previously blogged about the "power of prediction" for language teaching and prompting student language production. Very much along the lines of guessing games. Here's another stellar way - What's Next?
They are videos that show a scene. The teacher pauses the video and asks the students to say what will happen next. This can either be by offering some possible outcomes (A, B, C, D) or asking students to use their own thoughts (write down some "gambits" for prompting student language - "I think..... is / age going to ...." | "... is are possibly going to ..." | "... might ......" etc ).
Also see this video lesson perfect for "prediction"!
Here are some more videos in the "What happens next?" vein. Good for getting students to predict and use the future tense. I think .... will ....