Yes, Nokia 8 Sirocco does have the Corning Gorilla Glass 5 protection.
No. Nokia 8 Sirocco does not have the memory card slot. It has 128GB internal storage and it does have the OTG support.
No. Nokia 8 Sirocco does not have the 3.5 mm headphone jack. But inside the box, you will get it USB Type C to 3.5mm headphone cable to use your old headphones.
Nokia 8 Sirocco weight is around 177 grams.
There's no denying that Nokia 8 Sirocco is a step up from last year's model. With the Sirocco, HMD proves that it can design a phone that is stunning to look at and stands out in the crowded smartphone space.