MY understanding So far,

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There is Sum up of so Far developments in Tax Issue, Correct me if some thing wrong
Stamp and CVT is will be based on DC rate 3% Stamp and 2% CVT
There will be another Fair market rate or "Federal rate" withholding tax and Advanced income tax will be based on that for buyer 0.6 and 4% For Non Filer and 0.3 and 2% on Filer.
Seller will pay the 0.3 and 2% of Fair market Price withholding and advanced Income tax.
Gain Tax still no agreement as previous transactions sale deeds cant be retrieved in each and every area., Understanding is there are two Possibilities
[Current fedral rate - Previous DC Rate] X 10% [Unfair as it will be more than 10% of Actual gain]

Current federal Rate X 4% More likely to be Implemented

FBR tacking of White Money source is different issue, Possibly in each new deal source of White money as per "Federal Rate" will be Asked

FBR will Audit Last 5 years [not 10 years] Transection and will ask for White money source as per ? Old DC rate

Hopes
Hopefully all transactions in past will be considered white if declared [Still a speculation]

Caution
if Some Amnesty announced and people Fail to declare property and later FBR Audits and you are unable to Prove white money Source then Maximum Penalty can be 35% Fine of fair market Value at that time

Conclusion
Only Success so far is
No case to case evaluation of Property by State bank before each Purchase which was Not Practical anyway.
Reduction of FBR Audit from 10 years to 5 years