Sorry to squash your hopes dude, but its not looking good
I'll be in Vegas the exact same time and have been keeping an eye out as well
UFC 145 is scheduled for April 21st and they have already announced UFC on Fox 3 for May 5. So it would be really weird for them to throw in another event between the two, especially a PPV.
I still have some hope because you never know, but its not looking good at this point