Hi,
You can call this as semi-final... once through they will ask for Passports later. This happens with me too, they returned our passports (that was initially sent with all other documents: PCC/RPRF/MR).
I think, NDVO has stopped asking Passport requests with all additional documents. I guess this is good for the people who fly often... so now no need to block the passports for 1-2 months (on average). This is just my guess....!!!
Anyway coming to your questions:
1) where to obtain marriage que form? do i need to fill it or spouse?
-> I guess either they missed it as email attachment or they shipped it through regular postal mail. Feel free to open CSE to clarify, they will revert back to you immediately if they missed it... Trust me they replied to my Case Specific Query in less than an hour of opening it (if it is really important & they missed some info).
2) does this letter mean passport request

do i need to send passport now on the base of this letter?
-> No this is not a passport request. They will ask it again once they satisfied with other documents like PCC & Marriage queries (with photos). So, hold on, they will ask it later as to send "Valid Travel Documents for You & your Spouse".
Hope this answers your questions !!!

And congratulations for reaching the semi-final step.

In order for us to continue the processing of your application, we require the following:
Complete or provide proof of completion of the immigration medical examination yourself and spouse. This must be received by xxxx date.
Pay the right of permanent of residency fee yourself and spouse by xxxx date.
Complete marriage questionnaire for yourself
Marriage photos
PCC clearances
Indian Mailing Address. We do not mail passports outside INIDA/NEPAL/BHUTAN
1) where to obtain marriage que form? do i need to fill it or spouse?
2) does this letter mean passport request

do i need to send passport now on the base of this letter?
Please help my deadline is 30th march 2012