This is a decision you'll have to make yourself.
There are good reasons to keep your order, and good reasons to consider cancelling, but don't do either just because other people are.
Look at the clips: does this look like it will appeal to you and motivate you to workout? If so, then keep it. If not, then cancel. If you're torn (like me), wait for a while before deciding.
On one hand, the price of each workout will never be this low again, and as a pre-orderer, you'll be in on the excitement of the discussion as Catheites get and use the workouts, and might feel left out if you don't have it.
On the other hand, if you end up not liking many of the workouts, or it's really not the type of weight training you want to do, your money may be better spent on something else.
You could definitely have regrets either way (regrets about keeping it, or regrets about canceling). If you can decide which regrets you can more easily live with, you might have your answer.
(I'm trying to work through this myself!)