NEED HELP,WEIRD SITUATION

I could really use some advice here guys. I'm a 5th yr senior, have a pretty strong resume, good grades/school, had a ton of banking interviews this fall with not much luck. I could have graduated last may but came back another year to try to line up an analyst job. *[next two paragraphs background, question at bottom]

I was getting really hot and heavy with a regional BB office. They're really small and were formerly a boutique that got acquired. They do they're own recruiting and wanted to hire an analyst to start off cycle in January 2011, and said analyst had to be graduated and checked off by HR. I started talking to them in late September and we kept on having HR snags. In mid November I got an offer to do a spring internship w/ a solid MM IB that could lead to full time given an opening, only stipulation being that I had to be enrolled in school in the spring. I called the BB back before I accepted to make sure they were still on hold w/ their analyst recruiting and they were so I went ahead and signed the offer letter and started with the MM IB.

So today I was contacted by said BB saying they want to bring me in for a superday/final round (they'll pick the analyst out of the super day), again wanting a guy to start in January. I accepted the offer to interview, and they know about my internship with MM IB, but I didn't disclose (they didn't ask) that I had to push my graduation back to May to qualify for my current job. I went to my counselor this morning to see if I could graduate but no dice. The grace deadline to put in for graduation was almost a month ago. So basically there's no way I can officially graduate till May.

So how should I approach this? These are my two options as I see it:

1) Call them back on Monday and tell them what happened with the MM. See if they'd be cool with waiting for graduation confirmation in May. If not at least I'd be straight with them and they'd probably look my way again if something opens up later in the year.

2) Not say anything, move forward with the superday. I'm fairly certain I can land this job. I've grabbed coffee with the MD and a close family friend is a MD at a PE firm that uses this office almost exclusively for their m&a advisory. And if I get the offer drop the news on them then and maybe they'll be stoked enough on me to let me start in January.

Sorry for the tome guys, but I could use some advice.