1.) Will it also work+support for Kafka 1.1.0 (Latest stable, 3-2018)
Compatibility is up to the Kafka project as we simply consume the Kafka Client library that they release (this is why we choose to link to the Kafka project compatibility page). Bummer that it's giving a 503 right now
Maybe ping the Apache.org or Kafka Project folks about the outage of their website?
2.) Similar to Kafka 1.0.0, are both Scala 2.12 & 2.11 supported?
I'm not sure what you are asking. Can you clarify? What do you want to use Scala for in Logstash?
I'm not quite sure I follow. The Kafka compatibility documentation (to my knowledge) does not express anything about Scala. I recommend you consult with the Kafka community about this, as they're likely to have more details here.
For what it's worth, I can't recall any such compatibility problem in Logstash regarding Kafka Client and Kafka Broker where the cause at all mentioned Scala. I hope you are able to find your answers