1. AFAIK the new dust limit is 135-136 sats. I've personally been able to test with transactions that low and spend them.
2. The lower limit is 136 sats. Example outputs on tx used and spent on testnet here:
<a href='https://test.whatsonchain.com/address/mtvfzuhs9aB4jWJtxQsJYwfiRbnyJe1SPv'>https://test.whatsonchain.com/address/mtvfzuhs9aB4jWJtxQsJYwfiRbnyJe1SPv</a>
3. Referring to what miners will relay to fellow miners. If the lower limit (136) is such that the majority of miners have configured, then the tx will be valid and mined. If the limit has not been lowered (so still 546) then a TX w/ an output of 136 may not be relayed to enough nodes to be a valid tx and will not be mined (and eventually dropped from nodes' mempools).
1. AFAIK the new dust limit is 135-136 sats. I've personally been able to test with transactions that low and spend them.
2. The lower limit is 136 sats. Example outputs on tx used and spent on testnet here:
<a href='https://test.whatsonchain.com/address/mtvfzuhs9aB4jWJtxQsJYwfiRbnyJe1SPv'>https://test.whatsonchain.com/address/mtvfzuhs9aB4jWJtxQsJYwfiRbnyJe1SPv</a>
3. Referring to what miners will relay to fellow miners. If the lower limit (136) is such that the majority of miners have configured, then the tx will be valid and mined. If the limit has not been lowered (so still 546) then a TX w/ an output of 136 may not be relayed to enough nodes to be a valid tx and will not be mined (and eventually dropped from nodes' mempools).