I graduated from the ABSN program at OU in July '07. Overall, it was definitely a busy, but manageable program if you are good with time management. Since the program is new, at times things were a little unorganized but we all got through it
Most of that had to do with the online class system being changed after our first semester but I doubt your class will have to deal with that issue. If you have taken online classes before, that may help out some. I never had and I did just fine though.
The busiest semester as far as class schedules go was the first summer semester b/c there are several different lab sessions to attend since you will be enrolled in both Clinical I and Health Assessment. Actual clinicals will not start until the first part of July and I believe that those were on Thurs and Friday from 645am until about 3pm. The fall and spring semesters are not as hectic, but the material is more in-depth and specialized. Acute and Chronic Care I and II (human physiology of disease in relation to appropriate nursing care) will take up a lot of your time, but the professor is wonderful (if it's Moran).
As far as NCLEX goes, the program does prepare you well but most likely you won't feel that way when graduation comes around, haha. Practice NCLEX questions helped me very much and knowing your basic lab values is also a must. I passed NCLEX the first time, so the program must have done something right
Also, I have many, many study guides on my computer that I'm willing to share with you or your classmates if needed. Best of luck!