Hi,

This is from the Help Center:

All items not set to auto-request on your Wish List will be "hidden" from the system when a Hold is in effect. 

• If a Wish List book becomes available while a Hold is in effect, and the Wish List book is NOT set to auto-request:
  • you will be "passed over" for that copy
  • you will retain your place on the Wish List

• If a Wish List book becomes available while a Hold is in effect, and the Wish List book IS set to auto-request:
  • if you have credit(s) in your account to request the book, it will be requested for you automatically, and sent to the mailing address on your account.
  • if you don't have any credits in your account, you will be passed over for that copy, and retain your place on the Wish List.

If you place a book on your Wish List while a Hold is in effect, that Wish List item will not be hidden by the Hold.

Think of your non-auto-requested Wish List items as a birthday present.   Whatever is on your Wish List will be "wrapped up" by the Hold when it goes into effect, and the birthday present will be "hidden" from view by the Wrapping; anything placed on the birthday present after it has been wrapped (any newly Wishlisted books) will not be hidden from view.  This analogy also applies to how the Hold "hides" items on your Bookshelf. 

Auto-request items are not hidden by the Hold; however, they will be treated like they are hidden if you have no credits at the time a copy of the book becomes available when your account is on hold.

So yes, as long as you have credits, you'll get any auto-request WL books offered to you while on vacation  hold.

Yes, if they are on autorequest you will still receive them.  You can also send and receive pm's.