Can my wife visit the US while there is a pending I-130 visa?

If she is granted the visa waiver and she intends to visit not remain and CBP believes that she will depart, yes.

Is USCIS going to count my husband's days outside the US based on the last 3 years or based on the last 5 years?

Depends on whether the filing is under the 3 year or 5 year requirement.

We have heard different advice and don't know who to believe. It is possible to have someone review our case?

The petitioner is not required to attend the interview at the US consulate.

What will be the cut off date for U visa in this Fiscal year? Any guess?

The number of applications filed is not public. The cut off is determined by how many have been filed.

Applied H1-H4 COS and H4 EAD concurrently, H4 EAD approved and got EAD card but COS still shows "My case was received"

If you have documentation required on the form I-9 your employer may employ you. If you do not have status that authorizes employment you are not...

Fingerprints and biographic information will be run through US records.

Do i have to go for a Consulate interview and Stamping. H1 to H4 COS.

Since you no longer have H-4 status it is not proper to return to the US using the old H-4 visa. It is generally better to have approval than seek...

The I-130 is your spouses petition for you. Only your spouse may withdraw the petition. As my colleague noted you may have difficulty extending...

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