Yes, Samsung Galaxy S9 does have the IRIS sensor to unlock the phone.
Samsung Galaxy S9 box includes S9 mobile (with battery), sim ejector tool, earphone, USB power adapter, USB Type C Cable, Back Cover and ear plugs.
Samsung Galaxy S9 is available in 3 colors in India - Lilac Purple, Midnight Black and Coral Blue.
Yes, Samsung Galaxy S9 does have the 3.5 mm headphone jack.
Yes, Samsung Galaxy S9 is a hybrid sim mobile phone. Means, you can easily use either 2 sim cards or 1 sim card & 1 MicroSD card. You can use up to 400 GB MicroSD card with the phone. Samsung Galaxy S9 also has OTG support.
The Galaxy S9 may be failing to wow with the design but makes up for that with performance and new camera skills.