Nokia announced in WP8 summit couple of days ago that it will bring much waited Internet Sharing along with Flip to silence and New apps during June and July to global Lumia 800 and 710 user base.
Internet Sharing (Wi-Fi Hotspot)
Share your mobile internet connection over Wi-Fi with up to five client devices or computers.*
Flip to silence
Silence incoming calls by flipping your phone face down.
After updating, your Nokia Lumia 800 or Nokia Lumia 710 will be ready to install exclusive new applications available in the Windows Phone Marketplace (Camera Extras, Counters, Contact share, and more). – Nokia
These features should already be available for your Lumia 900 and 610.
These new features will already be available for the Nokia Lumia 900 and Nokia Lumia 610. – Nokia
You can follow availability by country and carrier from Nokia’s own dedicated site for the update.