Apart from a bit of merchandise in Disney Village I've never seen anything Power Rangers related at DLRP.
Maybe they want to keep PR separate from the parks (do they have anything in America, Japan or Hong Kong?) as they've had the rights to PR for 6 years now so they've had plenty of time if they did want something. I thought they may only want to use Disney created stuff in the parks but then of course there are attractions like Star Tours which is a co-collaboration between Disney and LucasArts.