I spoke to Howard Randall at Manco, the Rep for Arium.

He says that Arium continues to sell and support the Arium Echo Dev. system.

He says Arium is focusing manpower on their logic analyzer line so there is
no effort underway to support additional processors with the Arium Echo.
This may have lead to the rumors here at Atari that Arium is longer supporting
the Echo which others interpreted to mean it is no longer available.

Howard says production, sales, and support of the Arium Echo will continue
indefinitely.