Present Continuous: Future meaning

Hello, everybody!

I've found this video with a complete explanation of the present continuous for future use. The explanation is in Spanish, but I think it is complete and it might be useful for some of you. http://www.blueblocnotes.com/grammar/future-tenses/present-continuous-future
The only thing that's not included on the video is the idea of ARRANGEMENTS that we talked about last class. Here's a useful explanation of this: http://www.edufind.com/english/grammar/future_arrangements.php

Here you'll find the difference between present continuous (future) and be going to: http://www.myenglishpages.com/site_php_files/grammar-lesson-future-plan.php#.U3pZX_l5OBw

I hope it's useful!