Somebody had posted that they had heard Vidanta was putting some Grand Luxxe units in in Acapulco. I haven't been there, so don't know whether or not it's true; there was a rumor about some going in in Puerto Penasco as well. If sales is starting to sell them there is probably some truth to it; there is otherwise a bit of a communications gap between the sales side of things and the construction side. Anyway, they don't add to the rooms and suites part of the website until the rooms are available.
Wild guess: what they could be doing in Acapulco is modifying a few existing floors in one of the existing buildings to include the "Grand Suite Deluxxe" units. If the floor plan you got in the update doesn't have a deck with a plunge pool, it's likely to be in a Mayan Palace building - no doubt high in the building. If there is a deck with a plunge pool, it's likely to be in a Grand Mayan building, which would make these units a bit bigger than the DeLuxxe 1 BR ones in Riviera Maya. I'd be interested in seeing the floor plan if you can post it. If it does have a lockout, by the way, there will be a door on one of the walls of the floor plan; on some of the unit types they include a grayed out portion for the part you aren't buying and on some others they have the two separate unit types that compose the lockout on separate floor plans.
As for what it trades to, read it carefully. In the Grand Luxxe Villa category the Junior Villa is a studio/hotel unit that has a sitting room but doesn't have a kitchen, though it has a cabinet with a microwave and coffee maker; the Grand Luxxe Villa Suite is a 1 BR with the kitchen; and the Grand Luxxe Villa Master Suite is the 2 BR combination of the two. If the Grand Suite Deluxxe trades to a Grand Luxxe Villa Suite, it's the 1 BR version. If you have any inkling of proceeding with the upgrade, have them give you a floor plan for every unit that you can trade into. Similarly for the GL suite level, a Grand Luxxe Master Room is a studio; a Grand Luxxe suite is a 1 BR; and a Grand Luxxe Master Suite is the 2 BR combination of the two.
One other thing you could negotiate for if you proceed with the upgrade is an addendum allowing you to exchange to a higher level unit a couple of times. If you only travel alone, there wouldn't be much point in exchanging to a 2 BR of anything, but it might be worth it to be able to exchange into the Celebrate Park units when the Park opens. Those are in essentially a separate category, though they do have exchange rights into Vidanta. (BTW, the "Junior Suite DeLuxxe" is one of the names for a unit in the Celebrate Park units; it's not obvious to me whether that is what they mean, though.)
Anyway, the major difference I see between what you have and what they are offering you is the ability to book the new units in Acapulco and the 1 BR Villa suite if I've interpreted it right. If your current contract allows you to trade to a regular 1 BR Grand Luxxe Suite, that gets you one with a kitchen and a deck with a pool. Those are different than the one you're in now and they shouldn't shift you to one of those units like you're in now if you've reserved a regular one. As far as the studio loft ones in NV go, it may be that they weren't really fully booked but instead had the building closed if you were down there in the fall. They tend to close buildings in the low season when there is lower occupancy and had tower 5 closed except for the restaurant on the roof for a few months in the fall. In any case, don't feel obligated to upgrade on this trip - there will always be something else available for you on a later trip. Our experience has been that they track what you were offered and share that information between the sales staff in the other locations; they've improved the offers between visits when we've declined to upgrade. For me, by the way, the value in owning with Vidanta is in the ability to book weeks in the high season (Jan-Mar). Things might change with the Parks, but it's pretty easy to get an exchange in there in the low seasons for close to or less than the usage fees overall including the resort fees they charge now.