I've written an entry on my site about the 055 class destroyer, briefly going over the ship's history and discussing some of the key characteristics and specifications of the ship that we know about and which we expect, based on reliable rumours over the years and the characteristics of the mock up.
Projection: 055 class destroyer overview
Background:
In early 2013, rumours in the Chinese military watching community began to speak of a new large surface combatant under development for the Chinese Navy, with a tentative designation of 055. General descriptions flitted to and fro, describing a ship with over a hundred VLS with a displacement over 10,000 tons. However such rumours were initially treated with substantial caution if not outright disdain by some individuals in Chinese military watching circles. After all, the 052D class destroyer had only just arrived on the scene, and the lead ship had yet to enter service. A new cruiser sized ship seemed like fantasy.
However, in late 2013 more rumours from more reliable sources began to trickle in, with greater detail that looked plausible. Then in early 2014, pictures emerged of a mock up under construction, for what was clearly a large surface combatant, and Chinese state and military media began acknowledging the existence of a new surface combatant and even the 055 designation.
Construction of a distinctive mockup at the Chinese Navy test facility at Wuhan was discovered in early 2014
Thus the 055 class “large destroyer” (as described in Chinese parlance) was confirmed as the next upcoming major surface combatant for the Chinese Navy.