Chinos is going but not as an Entertainer. He might run a game or two, but won't be a full time Ents staff member
It looks like it will be nearly sold out if not sold out. Based on that I would have to say it is not overpriced. Having said that I haven't been yet, so my opinion may change.
The price isn't of line. You get the drink package and tips included. There will be no other charges unless you go for a fancy meal or any drink over $12. Also each regular cabin will only have 2 people per. Normally the cruise would go with a lot of 3 and 4 people per cabin so the price should be higher for this cruise and it really isn't.