Danny is quite right.. T2 will never do what T1 did, and despite 'kind of' getting a feel of her if you'd be on her, you can never relive the past, there are just too many things so very different, it won't ever replicate the real Titanic or what it really was like on board.
They're cashing in on the fame of the first one, and in the end they will cater more to the masses that want to 'live the movie', than to people that are actually very knowledgable about the ship and her demise. Cause the latter group is very small, and will not bring in enough money. But everyone's seen the movie, so many things that they will do to get the dollars rolling in will make the hairs of you Titanic buffs stand up straigh, I have no doubt about it.
I'm not trying to rain on anyone's parade, but it's just what is going to happen, logically. They will all want to go to the bow and have their arms outstretched moment.. etc.. and they'll let them do it too, I bet. In reality no passenger was allowed there.. It will be the movie afloat, and nothing like the real deal... they'll give tours of the boiler room, whatever you can think of.. all sorts of things that in reality would never have happened.. I'm sure you can think of dozens of examples. Although very nice, it's not being on the Titanic, it's just roleplaying on a large replicated floating movie set.
Apart from that politics also come into play too but let's not even go there.. but a real 'hommage to the past', it is not, and will never be. That's not what the money is being invested for.. It's all just about making more money and they can get way more money if they make this a 'Titanic, the Experience' type vacation voyage, than if they will put this ship into a replicated line service just to shuttle people across the pond as they once had.
She might look the same, but the past is the past, you can never get that back, and no one is actually going to pay the kind of prices they will no doubt charge, if everything on board is as it was back then, anyway.. for most passengers, it's wasn't very luxurious or enjoyable at all, only for the upper echelons of society. In the end it's all about the mighty dollar, it's nothing to do with reliving the past and honoring a legendary ship. That outlook on things is only true for a very small and niche group of people with an extraordinary interest in this ship, the rest of the tourists have no clue other than having seen the movie and the odd discovery channel documentary. And they just want to be like Jack and Rose.