The possibilities for interval training are endless. You can come up with an infinite number of variations in work and rest intervals depending on your goals and whether you want to focus on strength, power, endurance, etc. Today's kettlebell workout is moderate amount of work with short rest, so I would suggest light to medium weight and focus more on speed and quality of repetitions than going heavy. If you want to go heavier, I would increase the rest time so you can ensure good form on the exercises.
The double half snatch is a very challenging exercise that can quickly become taxing on the lower back if you go to heavy. If you've never tried it before, I highly encourage you to stay very light. It will still get your heart rate up, don't worry! ;)
Enjoy! As always, I love to hear from you so please tag me in your videos and let me know how the workout goes.