I was testing out the snapshot (Amazing stuff btw, I didn't expect anything close to stuff like this to come to vanilla) and I was testing out the redstone blocks and weighted plates and found this bug. If you have a strong redstone signal, then you connect a golden (light) pressure plate with a weak signal connected to the redstone it will "block" the signal. Once I played around with it a bit I can see some machines that it could be used for, however I think it is a bug that the golden plate does this, so I believe it should be it's own feature of a block, and this behavior of the plates should be removed.
Edit: oops, didn't notice this as a duplicate. I had used the search but didn't find that other post