The Midwinter variant of the Hyperion is a modernized version upgraded with current systems, minus gravity engines. Though the Hyperion design is old, it is durable and well into use after the destruction of B5 as is the Olympus and the upgraded Nova. The Minbari Sharlin design has been in use over 200 years, proving age doesn't necessarily mean a ship goes obsolete. With the EA's abilities to retrofit, reverse engineer and incorporate new technologies into their ships, it is feasible to assume those designs can continue in service for quite a while.
There are no other canon Cruisers aside the Hyperion. The most advanced EA Cruiser in B5 Wars is the Hyperion Theta (Midwinter) with a new command suite.