Just a guess...but if Expedia only shows 2 room cats, its probably because the others are sold out. Especially if you are looking to go in next 2 months I would think everything but GVS and Atrium are sold out since such a popular honeymoon time.
I would recommend doing a search on couples booking site to see what rooms are available. But yes, I think if rooms are available to upgrade they will sell to you. I've heard in the slower (late summer/fall) months this happens.
ps We love our GVS

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