H1b interview for future employment

Hi All, Please provide your suggestions on below scenario. We have filed an H1B petition with a consultancy for an internal project and its approved.
My interview is in next week and I want to understand below.

  1. Currently I am working for different company so Is it okay to say its for a future employment XXX?

  2. Since this is for a internal project can we say that?

  3. Should they ask my current company letters?

You state the fact whatever it is.

Sure.

Yes, make sure you have offer letter that clearly states the duties, place of employment and the salary offered. If internal project, include the details on the project, job role and duties.