The design of the project has not changed (yet) - it is simply a different artistic interpretation of the project. Renderings are just an artistic interpretation from blueprints, massing models and the architects that don't reflect with absolute accuracy what the building will ultimately look like - they give a general sense of the future.
I don't agree with CSW2424 assessment that this is the cheaping (which is a term too easily tossed around - buildings often don't have any change whatsoever in construction budgets, materials or design yet get accused of being "cheaped" by some observers based on a drawing they saw in an advertisement in a magazine put together by a undergrad art student or rendering firm based in Florida off of architectural drawings completed 2 or 3 years prior to a shovel going in the ground).