US F1 student visa application is refused pending additional required administrative processing?

Hello, I wanna ask anybody here about my US VISA status as indicated above.

I am Indonesian, but I took my VISA interview in Malaysia on 7th of June 2011. I took it in Malaysia because I was studying in a college there. This college provides an America's university transfer program that is not available in my home country. So, I have more clear information on how to apply F1 VISA in Malaysia than in Indonesia. I major in chemical engineering and I have been accepted into a university in USA.

The interview was going alright. I was really confident about my preparation. I have answered all questions as clearly as I could. But, the interview was not long, approx. 3 minutes. The interviewer just asked me a few questions about my previous institution (in malaysia), about what kind of degree that I will receive later in US, he also asked about family &relatives, and my latest academic transcript. After that, he just said if they need to do additional required administrative processing. I also noticed that my interviewer didn't ask about my financial documents which I thought financial documents were very important documents to issue a visa. Furthermore, he didn't bother asking about my purposes to study in my future university or why I major in chemical engineering.

He gave me a pink paper and my application and passport were returned back to me.

The pink paper is stating a statement above and telling me to be patient and not to call them to inquire about my status of my case. He said, there is no fix time when I will be contacted. However, they will contact me as soon as my application is ready. The pink letter also tells me to drop off my passport and the letter to any of the five drop off location after I have been contacted.

Now, I am a bit worry about my visa processing. I am afraid if I can't get my visa as soon as possible. I see most of my friends already got their f1 visa and booked their flights to US. Yet, I am still not sure about mine, and I can't do anything about it. In the mean time, I am back to Indonesia and waiting their call via email from here. I really hope I will be able to attend my school in this fall 2011. And the deadline to report to my school is this 21st of August 2011 ( as stated in my I-20).

So, any thoughts about my current condition?

and, what do you think if I book my flight now without my visa in my hand?

Thank you so much upfront.