I just finished the IMS year and, while it IS possible to get in during the IMS year, you definitely should not bank on it. You should also NOT bank on getting into Drexel, even if you get the guaranteed interview. A lot of people really expect to get into Drexel if they have great grades in IMS, and it doesn't always happen.
The best attitude to go into IMS with is the attitude that you will do very well that year and have a great application the following summer.
That being said: When I applied this year, I looked on previous IMS threads that named specific schools that will wait for mid-year grades. I don't remember them all, but they basically include a number of philly, new jersey and new york schools that know the program. I'll try to find the thread. Also, keep in mind that the schools will probably not receive your first semester grades and the recommendation letter from your assigned IMS advisor until the end of January. AND two of your first semester classes (Nutrition and Immuno) don't end until mid-February, so you won't receive grades for those classes until then. I got just under a 4.0 the first semester and, while I did get an interview from a school that waited for the grades, it was extremely late in the cycle-during their very last week of interviews.
I feel like a lot of people that get in during the year are people who were borderline applicants before, so with good MCATs and maybe 3.3-3.5 GPAs. Then if they do awesome in the program, it can help "bump them up" to a good applicant. I don't have numbers of people who did get in this year, or even estimates, since I'm sure that will be the next question
This is just my general feeling.
Oh and a little IMS secret that they don't like to reveal. They say a 3.0 in the program (above the average in every med school class) will make you competitive for med school. Later on in the program, we find out that - really- 3.0 looks good for DO schools, but MD schools like to see at least a 3.5. I could write an entire post on how hard you have to work to get a 3.5 and above in the program, but I will save that for another post or another IMSer.