In general there's no early entry. However, they are having early entry from May 28 through August 30 on Monday, Wednesday, and Friday to USF for Revenge of the Mummy only, but I'm not sure what the criteria is for early entry (the website says you have to be staying on a Universal Vacation of at least three days, but I'd bet an onsite stay might work too.).
That being said, since you get Express access with your room key there's really no need for early entry like Disney offers. I'll take Express access (at Universal) over early entry (at Disney) any time ...