Saw it last weekend at the Las Vegas Hilton. It is indeed part of the Star Trek exhibit/experience there. They still have the original experience for those that are wondering.
-----Spoliers----
'4D' starts of with you receiving a briefing at Conpernicus station from a Lt (live in the room with you) and the Doctor (Robert Picardo of Voyager) on the view screen. It seems that you have been identified as probably having a gene that makes you immune to the Borg nanoprobes and Star Fleet wishes to do some research with you. But before that research can start the station is attacked by a Borg cube. While the attack is underway several crewmen rush in and the floor shakes form the phaser blasts. The order is given to evacuate you to a shuttle pod. So you are quickly rushed into a passageway inside the station where before you can reach the shuttle several crewmen are attacked by the BOrg, and you yourself have some close encounters with them.
Eventually you reach the shuttle pod and are orderd to put on protective gogles (3d glasses) and enter the pod, which is a large theater decorated to look like a shuttle with a big view screen and crewmen 'flying' it. The floor will move and you will feel things such as wind and 'nanoprobes' while trying to escape. But eventually all is lost and you are pulled into the Borg cube for assimilation. After some additional 'fun' you are rescued by Capt. Janeway and the Voyager.
-------------Spoliers off--------
The whole encouter takes about 15 minutes and is great fun if you are a fan. Your ticket includes the other experience and of course a visit to Quark's Bar is a must afterwards.