Unsure on name and IMO but this is taken from the RDM website

RDM 059 - 2nd Generation Rocket for Captain Cook Cruises
I do apologise for the quality of the pic.. But I do believe it's the first pic of this vessel on the site.

RDM are proud to be building the stylish, new, Incat Crowther designed, low wash, 24m2nd Generation Rocket for service on Sydney Harbour. She will add to the Captain Cook fleet and supplement the 'hop on - hop off' service around the harbour. Designed and structured to NSCV 1C survey she can also do the run to Manly and on good days, venture offshore for possible whale watching expeditions

http://www.rdm.com.au/vesselproduct.php?id=41