Went by Cube in early March 2012 right after it opened for a special launch party run by a national website's local branch. Because of the weather/time of year the upstairs patio area wasn't opened yet but I did get a good luck at the entire main floor.
When you walk in the main doors you still feel as if you are walking into Ultra - which is what the venue used to be - but that is where the similarities end. You walk in through the doors to the main area and to your immediate left is the coat check. The whole inside of the main floor has been completely redone to change the feel of the venue. The bar has been moved from the southern wall on the west side to the eastern wall on the south side and there is another two bars as you go further into the club.
The booths are all this yellow vinyl? that looks right at home in the 1970s and the whole club feels like they are bringing back the look and style of the 1970s and 1980s and they did a great job with it. The new layout is way more open than it used to be when it was Ultra and I can see this being way more of a nightclub than Ultra was.
It seems that they have spared very little expense on the redesign and relaunch of this venue - they are very specifically differentiating it from its past as Ultra - and only time will tell what kind of crowd ends up populating it on a regular basis. Right now they are shooting for a 25+ crowd although their event posters say 23+ and one of them I saw even said "gentlemen 23+" so I guess ladies younger than 23+ were allowed to come in that evening. The club will be playing house I believe, DJ duo Manzone & Strong are resident DJs on Friday nights, and again in the no expense spared department they redid the DJ booth with input from Manzone & Strong. They've also moved the DJ booth from the northwestern corner of the club to the middle of the west wall putting a giant LCD screen on top of it too (see pics).
I didn't try any of their tapas menu but my friends ordered a couple of their sliders and thought they were absolutely delicious. But, make no mistake, this place is very much NOT a "Supper Club" anymore. It is a club that happens to have some appetizers on hand in case you get hungry.