i got the NL from KCC as well and my case number is in 12***  . I m planning to do AOS. I have been thru the web and called the KCC couple of times about this. So, as far I know you need to submit all the forms in your packet to KCC and dont forget to mention BCIS in the form if u wanna go wid da adjustment of status as well. As this year case upto 30,000 was current for asia region so u gotta very fare chance as well.
         and about the second letter i have heard that KCC won't send the second letter to us  if we wanna go wid AOS. they will provide all the information to USCIS and from there one can start the processing. You can also go to your nearby USCIS office and learn about al the procedures from there. I am planning to go there tomorrow. But dont forget to make the appointment thru infopass on USCIS website before goin there. All the best to you