The announcement is a little misleading — they're announcing two different things, not one:
* Scylla 3.0, which adds secondary indexes and materialized views; and
* OLTP and OLAP features, which are not ready.
I'm struggling to find any clear information on what's implied by OLTP, but from the roadmap [1], it looks like they're just adding Cassandra's LWTs, not ACID transactions. Last I heard, you couldn't build ACID on top of Cassandra/Scylla, since row updates across multiple keys cannot be done atomically. Calling this OLTP seems a little misleading.
* Scylla 3.0, which adds secondary indexes and materialized views; and
* OLTP and OLAP features, which are not ready.
I'm struggling to find any clear information on what's implied by OLTP, but from the roadmap [1], it looks like they're just adding Cassandra's LWTs, not ACID transactions. Last I heard, you couldn't build ACID on top of Cassandra/Scylla, since row updates across multiple keys cannot be done atomically. Calling this OLTP seems a little misleading.
[1] https://www.scylladb.com/product/technology/scylla-roadmap/