Okay, it can be done, but will take a little thinking and planning. The
first issue is know when a record is considered new and when it is considered
no longer new.
One way to identify new records would be during the import. Add a Yes/No
field to the table and call it something clever like NEW_REC. (sometimes my
brilliance amazes even me). I assume you are using an append query to add
the new records to the table. In that query set the value of NEW_REC to true.
For your form, add an invisible control bound to NEW_REC. Then for each
field you want to highligt for the new records, use conditional formatting to
make the appearance whatever you want if NEW_REC = True. You can do the same
for the printed report.
At some point, they will be no longer new. I would suggest an update query
that will chage NEW_REC from True to False. Where you execute this query
will depend on your business rules.